72576639031 has 4 divisors (see below), whose sum is σ = 78159457432. Its totient is φ = 66993820632.

The previous prime is 72576639029. The next prime is 72576639043. The reversal of 72576639031 is 13093667527.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72576639031 - 2¹ = 72576639029 is a prime.

It is a super-2 number, since 2×72576639031² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72576639061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2791409181 + ... + 2791409206.

It is an arithmetic number, because the mean of its divisors is an integer number (19539864358).

Almost surely, 2^72576639031 is an apocalyptic number.

72576639031 is a deficient number, since it is larger than the sum of its proper divisors (5582818401).

72576639031 is a wasteful number, since it uses less digits than its factorization.

72576639031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5582818400.

The product of its (nonzero) digits is 1428840, while the sum is 49.

The spelling of 72576639031 in words is "seventy-two billion, five hundred seventy-six million, six hundred thirty-nine thousand, thirty-one".