72997405920 has 72 divisors (see below), whose sum is σ = 249103652616. Its totient is φ = 19465974528.

The previous prime is 72997405903. The next prime is 72997405951. The reversal of 72997405920 is 2950479927.

72997405920 is a `hidden beast` number, since 7 + 2 + 9 + 9 + 7 + 40 + 592 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25344882 + ... + 25347761.

It is an arithmetic number, because the mean of its divisors is an integer number (3459772953).

Almost surely, 2^72997405920 is an apocalyptic number.

It is an amenable number.

72997405920 is an abundant number, since it is smaller than the sum of its proper divisors (176106246696).

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

72997405920 is a wasteful number, since it uses less digits than its factorization.

72997405920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50692664 (or 50692653 counting only the distinct ones).

The product of its (nonzero) digits is 2857680, while the sum is 54.

The spelling of 72997405920 in words is "seventy-two billion, nine hundred ninety-seven million, four hundred five thousand, nine hundred twenty".