64433639 has 2 divisors, whose sum is σ = 64433640. Its totient is φ = 64433638.

The previous prime is 64433627. The next prime is 64433653. The reversal of 64433639 is 93633446.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64433639 - 2⁴ = 64433623 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 (64433609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32216819 + 32216820.

It is an arithmetic number, because the mean of its divisors is an integer number (32216820).

Almost surely, 2^64433639 is an apocalyptic number.

64433639 is a deficient number, since it is larger than the sum of its proper divisors (1).

64433639 is an equidigital number, since it uses as much as digits as its factorization.

64433639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 38.

The square root of 64433639 is about 8027.0566834924. The cubic root of 64433639 is about 400.9013818345.

The spelling of 64433639 in words is "sixty-four million, four hundred thirty-three thousand, six hundred thirty-nine".