72894631 has 2 divisors, whose sum is σ = 72894632. Its totient is φ = 72894630.

The previous prime is 72894617. The next prime is 72894721. The reversal of 72894631 is 13649827.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72894631 - 2⁹ = 72894119 is a prime.

It is a super-2 number, since 2×72894631² = 10627254457252322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72894611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36447315 + 36447316.

It is an arithmetic number, because the mean of its divisors is an integer number (36447316).

Almost surely, 2^72894631 is an apocalyptic number.

72894631 is a deficient number, since it is larger than the sum of its proper divisors (1).

72894631 is an equidigital number, since it uses as much as digits as its factorization.

72894631 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 72576, while the sum is 40.

The square root of 72894631 is about 8537.8352642810. The cubic root of 72894631 is about 417.7327393452.

It can be divided in two parts, 728 and 94631, that added together give a palindrome (95359).

The spelling of 72894631 in words is "seventy-two million, eight hundred ninety-four thousand, six hundred thirty-one".