72972691 has 8 divisors (see below), whose sum is σ = 79709184. Its totient is φ = 66253320.

The previous prime is 72972649. The next prime is 72972701. The reversal of 72972691 is 19627927.

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 72972691 - 2¹¹ = 72970643 is a prime.

It is a super-3 number, since 3×72972691³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72922691) 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, 5650 + ... + 13336.

It is an arithmetic number, because the mean of its divisors is an integer number (9963648).

Almost surely, 2^72972691 is an apocalyptic number.

72972691 is a deficient number, since it is larger than the sum of its proper divisors (6736493).

72972691 is a wasteful number, since it uses less digits than its factorization.

72972691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8561.

The product of its digits is 95256, while the sum is 43.

The square root of 72972691 is about 8542.4054574809. The cubic root of 72972691 is about 417.8817973507.

The spelling of 72972691 in words is "seventy-two million, nine hundred seventy-two thousand, six hundred ninety-one".