28556556 has 24 divisors (see below), whose sum is σ = 76151040. Its totient is φ = 8158992.

The previous prime is 28556533. The next prime is 28556557. The reversal of 28556556 is 65565582.

It is a super-2 number, since 2×28556556² = 1630953781162272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (28556557) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 169896 + ... + 170063.

It is an arithmetic number, because the mean of its divisors is an integer number (3172960).

Almost surely, 2^28556556 is an apocalyptic number.

It is an amenable number.

28556556 is an abundant number, since it is smaller than the sum of its proper divisors (47594484).

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

28556556 is a wasteful number, since it uses less digits than its factorization.

28556556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339973 (or 339971 counting only the distinct ones).

The product of its digits is 360000, while the sum is 42.

The square root of 28556556 is about 5343.8334554887. The cubic root of 28556556 is about 305.6576546421.

It can be divided in two parts, 2 and 8556556, that added together give a palindrome (8556558).

The spelling of 28556556 in words is "twenty-eight million, five hundred fifty-six thousand, five hundred fifty-six".