28157885670 has 64 divisors (see below), whose sum is σ = 68356638720. Its totient is φ = 7422659328.

The previous prime is 28157885611. The next prime is 28157885699. The reversal of 28157885670 is 7658875182.

It is a self number, because there is not a number n which added to its sum of digits gives 28157885670.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1528434 + ... + 1546746.

It is an arithmetic number, because the mean of its divisors is an integer number (1068072480).

Almost surely, 2^28157885670 is an apocalyptic number.

28157885670 is an abundant number, since it is smaller than the sum of its proper divisors (40198753050).

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

28157885670 is a wasteful number, since it uses less digits than its factorization.

28157885670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18909.

The product of its (nonzero) digits is 7526400, while the sum is 57.

The spelling of 28157885670 in words is "twenty-eight billion, one hundred fifty-seven million, eight hundred eighty-five thousand, six hundred seventy".