72249664 has 14 divisors (see below), whose sum is σ = 143370554. Its totient is φ = 36124800.

The previous prime is 72249637. The next prime is 72249691. The reversal of 72249664 is 46694227.

It is an interprime number because it is at equal distance from previous prime (72249637) and next prime (72249691).

It can be written as a sum of positive squares in only one way, i.e., 71233600 + 1016064 = 8440^2 + 1008^2 .

It is a super-2 number, since 2×72249664² = 10440027896225792, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 564387 + ... + 564514.

Almost surely, 2^72249664 is an apocalyptic number.

It is an amenable number.

72249664 is a deficient number, since it is larger than the sum of its proper divisors (71120890).

72249664 is a wasteful number, since it uses less digits than its factorization.

72249664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128913 (or 1128903 counting only the distinct ones).

The product of its digits is 145152, while the sum is 40.

The square root of 72249664 is about 8499.9802352711. The cubic root of 72249664 is about 416.4970636307.

The spelling of 72249664 in words is "seventy-two million, two hundred forty-nine thousand, six hundred sixty-four".