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28110720 = 2735114
BaseRepresentation
bin110101100111…
…0111110000000
31221220011122210
41223032332000
524144020340
62442302120
7460636311
oct153167600
957804583
1028110720
1114960000
1294b7940
135a93081
143a3a608
152704180
hex1acef80

28110720 has 160 divisors (see below), whose sum is σ = 98562600. Its totient is φ = 6814720.

The previous prime is 28110703. The next prime is 28110737. The reversal of 28110720 is 2701182.

It is an interprime number because it is at equal distance from previous prime (28110703) and next prime (28110737).

It is a tau number, because it is divible by the number of its divisors (160).

It is a super-3 number, since 3×281107203 (a number of 23 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 2555515 + ... + 2555525.

Almost surely, 228110720 is an apocalyptic number.

28110720 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 28110720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49281300).

28110720 is an abundant number, since it is smaller than the sum of its proper divisors (70451880).

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

28110720 is an frugal number, since it uses more digits than its factorization.

28110720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66 (or 21 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 21.

The square root of 28110720 is about 5301.9543566500. The cubic root of 28110720 is about 304.0586221205.

The spelling of 28110720 in words is "twenty-eight million, one hundred ten thousand, seven hundred twenty".