28557636 has 24 divisors (see below), whose sum is σ = 68436480. Its totient is φ = 9261792.

The previous prime is 28557553. The next prime is 28557643. The reversal of 28557636 is 63675582.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31716 + ... + 32603.

It is an arithmetic number, because the mean of its divisors is an integer number (2851520).

Almost surely, 2^28557636 is an apocalyptic number.

It is an amenable number.

28557636 is an abundant number, since it is smaller than the sum of its proper divisors (39878844).

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

28557636 is a wasteful number, since it uses less digits than its factorization.

28557636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64363 (or 64361 counting only the distinct ones).

The product of its digits is 302400, while the sum is 42.

The square root of 28557636 is about 5343.9345055867. The cubic root of 28557636 is about 305.6615078858.

The spelling of 28557636 in words is "twenty-eight million, five hundred fifty-seven thousand, six hundred thirty-six".