64624631 has 2 divisors, whose sum is σ = 64624632. Its totient is φ = 64624630.

The previous prime is 64624627. The next prime is 64624639. The reversal of 64624631 is 13642646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64624631 - 2² = 64624627 is a prime.

It is a super-2 number, since 2×64624631² = 8352685863772322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64624639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32312315 + 32312316.

It is an arithmetic number, because the mean of its divisors is an integer number (32312316).

Almost surely, 2^64624631 is an apocalyptic number.

64624631 is a deficient number, since it is larger than the sum of its proper divisors (1).

64624631 is an equidigital number, since it uses as much as digits as its factorization.

64624631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 32.

The square root of 64624631 is about 8038.9446446657. The cubic root of 64624631 is about 401.2971038408.

The spelling of 64624631 in words is "sixty-four million, six hundred twenty-four thousand, six hundred thirty-one".