72511664 has 20 divisors (see below), whose sum is σ = 148756104. Its totient is φ = 34123008.

The previous prime is 72511633. The next prime is 72511667. The reversal of 72511664 is 46611527.

It is a self number, because there is not a number n which added to its sum of digits gives 72511664.

It is not an unprimeable number, because it can be changed into a prime (72511667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133022 + ... + 133565.

Almost surely, 2^72511664 is an apocalyptic number.

It is an amenable number.

72511664 is an abundant number, since it is smaller than the sum of its proper divisors (76244440).

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

72511664 is a wasteful number, since it uses less digits than its factorization.

72511664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266612 (or 266606 counting only the distinct ones).

The product of its digits is 10080, while the sum is 32.

The square root of 72511664 is about 8515.3780890810. The cubic root of 72511664 is about 416.9999060703. Note that the first 4 decimals are identical.

The spelling of 72511664 in words is "seventy-two million, five hundred eleven thousand, six hundred sixty-four".