72320685 has 16 divisors (see below), whose sum is σ = 117611520. Its totient is φ = 37938240.

The previous prime is 72320663. The next prime is 72320687. The reversal of 72320685 is 58602327.

It is not a de Polignac number, because 72320685 - 2⁶ = 72320621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72320687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38605 + ... + 40434.

It is an arithmetic number, because the mean of its divisors is an integer number (7350720).

Almost surely, 2^72320685 is an apocalyptic number.

It is an amenable number.

72320685 is a deficient number, since it is larger than the sum of its proper divisors (45290835).

72320685 is a wasteful number, since it uses less digits than its factorization.

72320685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79108.

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 72320685 is about 8504.1569247045. The cubic root of 72320685 is about 416.6334903362.

The spelling of 72320685 in words is "seventy-two million, three hundred twenty thousand, six hundred eighty-five".