72972728 has 16 divisors (see below), whose sum is σ = 137372760. Its totient is φ = 36340000.

The previous prime is 72972727. The next prime is 72972761. The reversal of 72972728 is 82727927.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72972727) 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, 16163 + ... + 20178.

Almost surely, 2^72972728 is an apocalyptic number.

It is an amenable number.

72972728 is a deficient number, since it is larger than the sum of its proper divisors (64400032).

72972728 is a wasteful number, since it uses less digits than its factorization.

72972728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36598 (or 36594 counting only the distinct ones).

The product of its digits is 197568, while the sum is 44.

The square root of 72972728 is about 8542.4076231470. The cubic root of 72972728 is about 417.8818679782.

The spelling of 72972728 in words is "seventy-two million, nine hundred seventy-two thousand, seven hundred twenty-eight".