72913664 has 18 divisors (see below), whose sum is σ = 145543020. Its totient is φ = 36456704.

The previous prime is 72913661. The next prime is 72913669. The reversal of 72913664 is 46631927.

It is not an unprimeable number, because it can be changed into a prime (72913661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 142154 + ... + 142665.

Almost surely, 2^72913664 is an apocalyptic number.

It is an amenable number.

72913664 is a deficient number, since it is larger than the sum of its proper divisors (72629356).

72913664 is an equidigital number, since it uses as much as digits as its factorization.

72913664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284835 (or 284821 counting only the distinct ones).

The product of its digits is 54432, while the sum is 38.

The square root of 72913664 is about 8538.9498183325. The cubic root of 72913664 is about 417.7690932588.

The spelling of 72913664 in words is "seventy-two million, nine hundred thirteen thousand, six hundred sixty-four".