72497978864 has 40 divisors (see below), whose sum is σ = 148900291200. Its totient is φ = 34077052928.

The previous prime is 72497978863. The next prime is 72497978869. The reversal of 72497978864 is 46887979427.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72497978863) 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 7 ways as a sum of consecutive naturals, for example, 80312 + ... + 389160.

It is an arithmetic number, because the mean of its divisors is an integer number (3722507280).

Almost surely, 2^72497978864 is an apocalyptic number.

It is an amenable number.

72497978864 is an abundant number, since it is smaller than the sum of its proper divisors (76402312336).

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

72497978864 is a wasteful number, since it uses less digits than its factorization.

72497978864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 309737 (or 309731 counting only the distinct ones).

The product of its digits is 341397504, while the sum is 71.

The spelling of 72497978864 in words is "seventy-two billion, four hundred ninety-seven million, nine hundred seventy-eight thousand, eight hundred sixty-four".