28157867504 has 80 divisors (see below), whose sum is σ = 60192730752. Its totient is φ = 12678107904.

The previous prime is 28157867501. The next prime is 28157867527. The reversal of 28157867504 is 40576875182.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28157867501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10400519 + ... + 10403225.

Almost surely, 2^28157867504 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 28157867504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30096365376).

28157867504 is an abundant number, since it is smaller than the sum of its proper divisors (32034863248).

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

28157867504 is a wasteful number, since it uses less digits than its factorization.

28157867504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3934 (or 3928 counting only the distinct ones).

The product of its (nonzero) digits is 3763200, while the sum is 53.

The spelling of 28157867504 in words is "twenty-eight billion, one hundred fifty-seven million, eight hundred sixty-seven thousand, five hundred four".