28231758972 has 36 divisors (see below), whose sum is σ = 71437196376. Its totient is φ = 9400883040.

The previous prime is 28231758959. The next prime is 28231758991. The reversal of 28231758972 is 27985713282.

28231758972 is a `hidden beast` number, since 28 + 2 + 31 + 7 + 589 + 7 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 368863 + ... + 438774.

It is an arithmetic number, because the mean of its divisors is an integer number (1984366566).

Almost surely, 2^28231758972 is an apocalyptic number.

It is an amenable number.

28231758972 is an abundant number, since it is smaller than the sum of its proper divisors (43205437404).

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

28231758972 is a wasteful number, since it uses less digits than its factorization.

28231758972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 808618 (or 808613 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 54.

The spelling of 28231758972 in words is "twenty-eight billion, two hundred thirty-one million, seven hundred fifty-eight thousand, nine hundred seventy-two".