64624709 has 2 divisors, whose sum is σ = 64624710. Its totient is φ = 64624708.

The previous prime is 64624639. The next prime is 64624717. The reversal of 64624709 is 90742646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61183684 + 3441025 = 7822^2 + 1855^2 .

It is a cyclic number.

It is not a de Polignac number, because 64624709 - 2²⁴ = 47847493 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64624799) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32312354 + 32312355.

It is an arithmetic number, because the mean of its divisors is an integer number (32312355).

Almost surely, 2^64624709 is an apocalyptic number.

It is an amenable number.

64624709 is a deficient number, since it is larger than the sum of its proper divisors (1).

64624709 is an equidigital number, since it uses as much as digits as its factorization.

64624709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72576, while the sum is 38.

The square root of 64624709 is about 8038.9494960474. The cubic root of 64624709 is about 401.2972652920.

The spelling of 64624709 in words is "sixty-four million, six hundred twenty-four thousand, seven hundred nine".