231272937728 has 54 divisors (see below), whose sum is σ = 537012693126. Its totient is φ = 99116967936.

The previous prime is 231272937703. The next prime is 231272937751. The reversal of 231272937728 is 827739272132.

It can be written as a sum of positive squares in only one way, i.e., 169506770944 + 61766166784 = 411712^2 + 248528^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 231272937728.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9205925 + ... + 9231012.

Almost surely, 2^231272937728 is an apocalyptic number.

231272937728 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

231272937728 is an abundant number, since it is smaller than the sum of its proper divisors (305739755398).

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

231272937728 is an equidigital number, since it uses as much as digits as its factorization.

231272937728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18436967 (or 18436946 counting only the distinct ones).

The product of its digits is 3556224, while the sum is 53.

The spelling of 231272937728 in words is "two hundred thirty-one billion, two hundred seventy-two million, nine hundred thirty-seven thousand, seven hundred twenty-eight".