28857408 has 28 divisors (see below), whose sum is σ = 76352400. Its totient is φ = 9619072.

The previous prime is 28857391. The next prime is 28857419. The reversal of 28857408 is 80475882.

It is a self number, because there is not a number n which added to its sum of digits gives 28857408.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74958 + ... + 75341.

Almost surely, 2^28857408 is an apocalyptic number.

It is an amenable number.

28857408 is an abundant number, since it is smaller than the sum of its proper divisors (47494992).

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

28857408 is a wasteful number, since it uses less digits than its factorization.

28857408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150314 (or 150304 counting only the distinct ones).

The product of its (nonzero) digits is 143360, while the sum is 42.

The square root of 28857408 is about 5371.9091578321. The cubic root of 28857408 is about 306.7273057990.

The spelling of 28857408 in words is "twenty-eight million, eight hundred fifty-seven thousand, four hundred eight".