72959991 has 16 divisors (see below), whose sum is σ = 104974464. Its totient is φ = 44807904.

The previous prime is 72959977. The next prime is 72960007. The reversal of 72959991 is 19995927.

It is not a de Polignac number, because 72959991 - 2⁹ = 72959479 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72959921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21300 + ... + 24486.

It is an arithmetic number, because the mean of its divisors is an integer number (6560904).

Almost surely, 2^72959991 is an apocalyptic number.

72959991 is a deficient number, since it is larger than the sum of its proper divisors (32014473).

72959991 is a wasteful number, since it uses less digits than its factorization.

72959991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3790.

The product of its digits is 459270, while the sum is 51.

The square root of 72959991 is about 8541.6620747955. The cubic root of 72959991 is about 417.8575535473.

The spelling of 72959991 in words is "seventy-two million, nine hundred fifty-nine thousand, nine hundred ninety-one".