72561886736 has 40 divisors (see below), whose sum is σ = 142393453944. Its totient is φ = 35817062400.

The previous prime is 72561886729. The next prime is 72561886741. The reversal of 72561886736 is 63768816527.

It can be written as a sum of positive squares in 4 ways, for example, as 20322213136 + 52239673600 = 142556^2 + 228560^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 564056 + ... + 680648.

Almost surely, 2^72561886736 is an apocalyptic number.

It is an amenable number.

72561886736 is a deficient number, since it is larger than the sum of its proper divisors (69831567208).

72561886736 is a wasteful number, since it uses less digits than its factorization.

72561886736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117099 (or 117093 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 59.

The spelling of 72561886736 in words is "seventy-two billion, five hundred sixty-one million, eight hundred eighty-six thousand, seven hundred thirty-six".