28204056 has 96 divisors (see below), whose sum is σ = 82134000. Its totient is φ = 8716032.

The previous prime is 28204051. The next prime is 28204067. The reversal of 28204056 is 65040282.

It is a super-2 number, since 2×28204056² = 1590937549702272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28204051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 72310 + ... + 72698.

Almost surely, 2^28204056 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 28204056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41067000).

28204056 is an abundant number, since it is smaller than the sum of its proper divisors (53929944).

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

28204056 is a wasteful number, since it uses less digits than its factorization.

28204056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473 (or 466 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 28204056 is about 5310.7490997034. The cubic root of 28204056 is about 304.3947722174.

The spelling of 28204056 in words is "twenty-eight million, two hundred four thousand, fifty-six".