72656993 has 2 divisors, whose sum is σ = 72656994. Its totient is φ = 72656992.

The previous prime is 72656989. The next prime is 72656999. The reversal of 72656993 is 39965627.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 68939809 + 3717184 = 8303^2 + 1928^2 .

It is a cyclic number.

It is not a de Polignac number, because 72656993 - 2² = 72656989 is a prime.

It is not a weakly prime, because it can be changed into another prime (72656999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36328496 + 36328497.

It is an arithmetic number, because the mean of its divisors is an integer number (36328497).

Almost surely, 2^72656993 is an apocalyptic number.

It is an amenable number.

72656993 is a deficient number, since it is larger than the sum of its proper divisors (1).

72656993 is an equidigital number, since it uses as much as digits as its factorization.

72656993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 612360, while the sum is 47.

The square root of 72656993 is about 8523.9071440273. The cubic root of 72656993 is about 417.2783060519.

The spelling of 72656993 in words is "seventy-two million, six hundred fifty-six thousand, nine hundred ninety-three".