28557936 has 120 divisors (see below), whose sum is σ = 88498800. Its totient is φ = 8595840.

The previous prime is 28557929. The next prime is 28557941. The reversal of 28557936 is 63975582.

28557936 = 150² + 151² + ... + 446².

It is a happy number.

28557936 is a `hidden beast` number, since 2 + 8 + 557 + 93 + 6 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 28557891 and 28557900.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 191590 + ... + 191738.

It is an arithmetic number, because the mean of its divisors is an integer number (737490).

Almost surely, 2^28557936 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28557936, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44249400).

28557936 is an abundant number, since it is smaller than the sum of its proper divisors (59940864).

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

28557936 is a wasteful number, since it uses less digits than its factorization.

28557936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196 (or 165 counting only the distinct ones).

The product of its digits is 453600, while the sum is 45.

The square root of 28557936 is about 5343.9625747193. The cubic root of 28557936 is about 305.6625782140.

The spelling of 28557936 in words is "twenty-eight million, five hundred fifty-seven thousand, nine hundred thirty-six".