72813988 has 18 divisors (see below), whose sum is σ = 137981634. Its totient is φ = 33606144.

The previous prime is 72813971. The next prime is 72813989. The reversal of 72813988 is 88931827.

It can be written as a sum of positive squares in 3 ways, for example, as 6749604 + 66064384 = 2598^2 + 8128^2 .

It is not an unprimeable number, because it can be changed into a prime (72813989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 53181 + ... + 54532.

Almost surely, 2^72813988 is an apocalyptic number.

It is an amenable number.

72813988 is a deficient number, since it is larger than the sum of its proper divisors (65167646).

72813988 is a wasteful number, since it uses less digits than its factorization.

72813988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107743 (or 107728 counting only the distinct ones).

The product of its digits is 193536, while the sum is 46.

The square root of 72813988 is about 8533.1112731524. Note that the first 3 decimals coincide. The cubic root of 72813988 is about 417.5786372248.

The spelling of 72813988 in words is "seventy-two million, eight hundred thirteen thousand, nine hundred eighty-eight".