72591643 has 2 divisors, whose sum is σ = 72591644. Its totient is φ = 72591642.

The previous prime is 72591593. The next prime is 72591661. The reversal of 72591643 is 34619527.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72591643 is a prime.

It is not a weakly prime, because it can be changed into another prime (72591943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36295821 + 36295822.

It is an arithmetic number, because the mean of its divisors is an integer number (36295822).

Almost surely, 2^72591643 is an apocalyptic number.

72591643 is a deficient number, since it is larger than the sum of its proper divisors (1).

72591643 is an equidigital number, since it uses as much as digits as its factorization.

72591643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 45360, while the sum is 37.

The square root of 72591643 is about 8520.0729456971. The cubic root of 72591643 is about 417.1531640853.

The spelling of 72591643 in words is "seventy-two million, five hundred ninety-one thousand, six hundred forty-three".