72688691 has 2 divisors, whose sum is σ = 72688692. Its totient is φ = 72688690.

The previous prime is 72688687. The next prime is 72688739. The reversal of 72688691 is 19688627.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72688691 - 2² = 72688687 is a prime.

It is not a weakly prime, because it can be changed into another prime (72688601) 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, 36344345 + 36344346.

It is an arithmetic number, because the mean of its divisors is an integer number (36344346).

Almost surely, 2^72688691 is an apocalyptic number.

72688691 is a deficient number, since it is larger than the sum of its proper divisors (1).

72688691 is an equidigital number, since it uses as much as digits as its factorization.

72688691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 47.

The square root of 72688691 is about 8525.7662998701. The cubic root of 72688691 is about 417.3389791047.

The spelling of 72688691 in words is "seventy-two million, six hundred eighty-eight thousand, six hundred ninety-one".