72697644 has 36 divisors (see below), whose sum is σ = 194574744. Its totient is φ = 22806912.

The previous prime is 72697607. The next prime is 72697657. The reversal of 72697644 is 44679627.

It is a tau number, because it is divible by the number of its divisors (36).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 72697644.

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, 58782 + ... + 60005.

It is an arithmetic number, because the mean of its divisors is an integer number (5404854).

Almost surely, 2^72697644 is an apocalyptic number.

It is an amenable number.

72697644 is an abundant number, since it is smaller than the sum of its proper divisors (121877100).

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

72697644 is a wasteful number, since it uses less digits than its factorization.

72697644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118814 (or 118809 counting only the distinct ones).

The product of its digits is 508032, while the sum is 45.

The square root of 72697644 is about 8526.2913391462. The cubic root of 72697644 is about 417.3561128222.

The spelling of 72697644 in words is "seventy-two million, six hundred ninety-seven thousand, six hundred forty-four".