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28823040 = 29345139
BaseRepresentation
bin110110111110…
…0111000000000
32000020100210000
41231330320000
524334314130
62505440000
7466664121
oct155747000
960210700
1028823040
11152a71a4
1297a0000
135c8236c
143b84048
1527e5260
hex1b7ce00

28823040 has 200 divisors, whose sum is σ = 103977720. Its totient is φ = 7630848.

The previous prime is 28823021. The next prime is 28823051. The reversal of 28823040 is 4032882.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 28822995 and 28823013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 207291 + ... + 207429.

Almost surely, 228823040 is an apocalyptic number.

28823040 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 28823040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (51988860).

28823040 is an abundant number, since it is smaller than the sum of its proper divisors (75154680).

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

28823040 is an equidigital number, since it uses as much as digits as its factorization.

28823040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28823040 is about 5368.7093421045. The cubic root of 28823040 is about 306.6054908426.

The spelling of 28823040 in words is "twenty-eight million, eight hundred twenty-three thousand, forty".