72323557632 has 54 divisors (see below), whose sum is σ = 208526653062. Its totient is φ = 24107851776.

The previous prime is 72323557619. The next prime is 72323557679. The reversal of 72323557632 is 23675532327.

72323557632 is a `hidden beast` number, since 7 + 2 + 3 + 2 + 3 + 5 + 5 + 7 + 632 = 666.

It can be written as a sum of positive squares in only one way, i.e., 60586868736 + 11736688896 = 246144^2 + 108336^2 .

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, 15692913 + ... + 15697520.

Almost surely, 2^72323557632 is an apocalyptic number.

72323557632 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

72323557632 is an abundant number, since it is smaller than the sum of its proper divisors (136203095430).

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

72323557632 is a wasteful number, since it uses less digits than its factorization.

72323557632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31390455 (or 31390438 counting only the distinct ones).

The product of its digits is 1587600, while the sum is 45.

The spelling of 72323557632 in words is "seventy-two billion, three hundred twenty-three million, five hundred fifty-seven thousand, six hundred thirty-two".