64433609 has 2 divisors, whose sum is σ = 64433610. Its totient is φ = 64433608.

The previous prime is 64433599. The next prime is 64433623. The reversal of 64433609 is 90633446.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51437584 + 12996025 = 7172^2 + 3605^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64433609 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64433639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32216804 + 32216805.

It is an arithmetic number, because the mean of its divisors is an integer number (32216805).

Almost surely, 2^64433609 is an apocalyptic number.

It is an amenable number.

64433609 is a deficient number, since it is larger than the sum of its proper divisors (1).

64433609 is an equidigital number, since it uses as much as digits as its factorization.

64433609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 35.

The square root of 64433609 is about 8027.0548148122. The cubic root of 64433609 is about 400.9013196153.

The spelling of 64433609 in words is "sixty-four million, four hundred thirty-three thousand, six hundred nine".