64624309 has 2 divisors, whose sum is σ = 64624310. Its totient is φ = 64624308.

The previous prime is 64624303. The next prime is 64624337. The reversal of 64624309 is 90342646.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36300625 + 28323684 = 6025^2 + 5322^2 .

It is a cyclic number.

It is not a de Polignac number, because 64624309 - 2²⁵ = 31069877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64624303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32312154 + 32312155.

It is an arithmetic number, because the mean of its divisors is an integer number (32312155).

Almost surely, 2^64624309 is an apocalyptic number.

It is an amenable number.

64624309 is a deficient number, since it is larger than the sum of its proper divisors (1).

64624309 is an equidigital number, since it uses as much as digits as its factorization.

64624309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 34.

The square root of 64624309 is about 8038.9246171363. The cubic root of 64624309 is about 401.2964373360.

The spelling of 64624309 in words is "sixty-four million, six hundred twenty-four thousand, three hundred nine".