72992731 has 8 divisors (see below), whose sum is σ = 87047424. Its totient is φ = 59844840.

The previous prime is 72992719. The next prime is 72992741. The reversal of 72992731 is 13729927.

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 72992731 - 2⁹ = 72992219 is a prime.

It is a super-2 number, since 2×72992731² = 10655877557676722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72992741) 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, 226525 + ... + 226846.

It is an arithmetic number, because the mean of its divisors is an integer number (10880928).

Almost surely, 2^72992731 is an apocalyptic number.

72992731 is a deficient number, since it is larger than the sum of its proper divisors (14054693).

72992731 is a wasteful number, since it uses less digits than its factorization.

72992731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 453401.

The product of its digits is 47628, while the sum is 40.

The square root of 72992731 is about 8543.5783486780. The cubic root of 72992731 is about 417.9200472066.

The spelling of 72992731 in words is "seventy-two million, nine hundred ninety-two thousand, seven hundred thirty-one".