28556900 has 18 divisors (see below), whose sum is σ = 61968690. Its totient is φ = 11422720.

The previous prime is 28556881. The next prime is 28556903. The reversal of 28556900 is 965582.

It can be written as a sum of positive squares in 3 ways, for example, as 1350244 + 27206656 = 1162^2 + 5216^2 .

It is a super-2 number, since 2×28556900² = 1630993075220000, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28556903) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142685 + ... + 142884.

It is an arithmetic number, because the mean of its divisors is an integer number (3442705).

Almost surely, 2^28556900 is an apocalyptic number.

28556900 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28556900 is an abundant number, since it is smaller than the sum of its proper divisors (33411790).

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

28556900 is a wasteful number, since it uses less digits than its factorization.

28556900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285583 (or 285576 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 35.

The square root of 28556900 is about 5343.8656420236. The cubic root of 28556900 is about 305.6588819821.

The spelling of 28556900 in words is "twenty-eight million, five hundred fifty-six thousand, nine hundred".