72909293522 has 54 divisors (see below), whose sum is σ = 125146440207. Its totient is φ = 31838126112.

The previous prime is 72909293467. The next prime is 72909293543. The reversal of 72909293522 is 22539290927.

It can be written as a sum of positive squares in 5 ways, for example, as 1332177001 + 71577116521 = 36499^2 + 267539^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=190931.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 94319528 + ... + 94320300.

Almost surely, 2^72909293522 is an apocalyptic number.

72909293522 is a deficient number, since it is larger than the sum of its proper divisors (52237146685).

72909293522 is an equidigital number, since it uses as much as digits as its factorization.

72909293522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1612 (or 807 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 50.

Multiplying 72909293522 by its sum of digits (50), we get a square (3645464676100 = 1909310²).

The spelling of 72909293522 in words is "seventy-two billion, nine hundred nine million, two hundred ninety-three thousand, five hundred twenty-two".