72891473572 has 12 divisors (see below), whose sum is σ = 127628196556. Its totient is φ = 36426274560.

The previous prime is 72891473537. The next prime is 72891473591. The reversal of 72891473572 is 27537419827.

It can be written as a sum of positive squares in 2 ways, for example, as 7112560896 + 65778912676 = 84336^2 + 256474^2 .

It is a hoax number, since the sum of its digits (55) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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, 4857129 + ... + 4872112.

Almost surely, 2^72891473572 is an apocalyptic number.

It is an amenable number.

72891473572 is a deficient number, since it is larger than the sum of its proper divisors (54736722984).

72891473572 is a wasteful number, since it uses less digits than its factorization.

72891473572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9731118 (or 9731116 counting only the distinct ones).

The product of its digits is 5927040, while the sum is 55.

The spelling of 72891473572 in words is "seventy-two billion, eight hundred ninety-one million, four hundred seventy-three thousand, five hundred seventy-two".