72217372 has 12 divisors (see below), whose sum is σ = 126511336. Its totient is φ = 36071280.

The previous prime is 72217361. The next prime is 72217381. The reversal of 72217372 is 27371227.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4758 + ... + 12925.

Almost surely, 2^72217372 is an apocalyptic number.

It is an amenable number.

72217372 is a deficient number, since it is larger than the sum of its proper divisors (54293964).

72217372 is a wasteful number, since it uses less digits than its factorization.

72217372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18708 (or 18706 counting only the distinct ones).

The product of its digits is 8232, while the sum is 31.

The square root of 72217372 is about 8498.0804891458. The cubic root of 72217372 is about 416.4350032386.

Adding to 72217372 its reverse (27371227), we get a palindrome (99588599).

The spelling of 72217372 in words is "seventy-two million, two hundred seventeen thousand, three hundred seventy-two".