64572691 has 2 divisors, whose sum is σ = 64572692. Its totient is φ = 64572690.

The previous prime is 64572679. The next prime is 64572701. The reversal of 64572691 is 19627546.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64572691 - 2¹⁹ = 64048403 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64572611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32286345 + 32286346.

It is an arithmetic number, because the mean of its divisors is an integer number (32286346).

Almost surely, 2^64572691 is an apocalyptic number.

64572691 is a deficient number, since it is larger than the sum of its proper divisors (1).

64572691 is an equidigital number, since it uses as much as digits as its factorization.

64572691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 64572691 is about 8035.7134717460. The cubic root of 64572691 is about 401.1895650804.

The spelling of 64572691 in words is "sixty-four million, five hundred seventy-two thousand, six hundred ninety-one".