72992681 has 8 divisors (see below), whose sum is σ = 76638720. Its totient is φ = 69421968.

The previous prime is 72992677. The next prime is 72992687. The reversal of 72992681 is 18629927.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72992681 - 2² = 72992677 is a prime.

It is a super-2 number, since 2×72992681² = 10655862959135522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72992687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16841 + ... + 20726.

It is an arithmetic number, because the mean of its divisors is an integer number (9579840).

Almost surely, 2^72992681 is an apocalyptic number.

It is an amenable number.

72992681 is a deficient number, since it is larger than the sum of its proper divisors (3646039).

72992681 is a wasteful number, since it uses less digits than its factorization.

72992681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37663.

The product of its digits is 108864, while the sum is 44.

The square root of 72992681 is about 8543.5754225032. The cubic root of 72992681 is about 417.9199517815.

The spelling of 72992681 in words is "seventy-two million, nine hundred ninety-two thousand, six hundred eighty-one".