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28023000 = 233539341
BaseRepresentation
bin110101011100…
…1100011011000
31221201201022220
41222321203120
524133214000
62440344040
7460122465
oct152714330
957651286
1028023000
1114900105
129475020
135a62175
143a1666c
1526d81a0
hex1ab98d8

28023000 has 64 divisors (see below), whose sum is σ = 87441120. Its totient is φ = 7472000.

The previous prime is 28022999. The next prime is 28023001. The reversal of 28023000 is 32082.

It is an interprime number because it is at equal distance from previous prime (28022999) and next prime (28023001).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28023001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1671 + ... + 7670.

Almost surely, 228023000 is an apocalyptic number.

28023000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28023000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43720560).

28023000 is an abundant number, since it is smaller than the sum of its proper divisors (59418120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28023000 is a wasteful number, since it uses less digits than its factorization.

28023000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9365 (or 9351 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 28023000 is about 5293.6754717304. The cubic root of 28023000 is about 303.7420191302.

Adding to 28023000 its reverse (32082), we get a palindrome (28055082).

The spelling of 28023000 in words is "twenty-eight million, twenty-three thousand".

Divisors: 1 2 3 4 5 6 8 10 12 15 20 24 25 30 40 50 60 75 100 120 125 150 200 250 300 375 500 600 750 1000 1500 3000 9341 18682 28023 37364 46705 56046 74728 93410 112092 140115 186820 224184 233525 280230 373640 467050 560460 700575 934100 1120920 1167625 1401150 1868200 2335250 2802300 3502875 4670500 5604600 7005750 9341000 14011500 28023000