64264639 has 2 divisors, whose sum is σ = 64264640. Its totient is φ = 64264638.

The previous prime is 64264633. The next prime is 64264657. The reversal of 64264639 is 93646246.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64264639 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64264633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32132319 + 32132320.

It is an arithmetic number, because the mean of its divisors is an integer number (32132320).

Almost surely, 2^64264639 is an apocalyptic number.

64264639 is a deficient number, since it is larger than the sum of its proper divisors (1).

64264639 is an equidigital number, since it uses as much as digits as its factorization.

64264639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 186624, while the sum is 40.

The square root of 64264639 is about 8016.5228746633. The cubic root of 64264639 is about 400.5505730755.

The spelling of 64264639 in words is "sixty-four million, two hundred sixty-four thousand, six hundred thirty-nine".