28537191664 has 80 divisors (see below), whose sum is σ = 58752489600. Its totient is φ = 13390071552.

The previous prime is 28537191659. The next prime is 28537191671. The reversal of 28537191664 is 46619173582.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19997319 + ... + 19998745.

It is an arithmetic number, because the mean of its divisors is an integer number (734406120).

Almost surely, 2^28537191664 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 28537191664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29376244800).

28537191664 is an abundant number, since it is smaller than the sum of its proper divisors (30215297936).

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

28537191664 is a wasteful number, since it uses less digits than its factorization.

28537191664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030 (or 2024 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 52.

The spelling of 28537191664 in words is "twenty-eight billion, five hundred thirty-seven million, one hundred ninety-one thousand, six hundred sixty-four".