64433665 has 4 divisors (see below), whose sum is σ = 77320404. Its totient is φ = 51546928.

The previous prime is 64433653. The next prime is 64433671. The reversal of 64433665 is 56633446.

64433665 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 49449024 + 14984641 = 7032^2 + 3871^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64433665 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6443362 + ... + 6443371.

It is an arithmetic number, because the mean of its divisors is an integer number (19330101).

Almost surely, 2^64433665 is an apocalyptic number.

It is an amenable number.

64433665 is a deficient number, since it is larger than the sum of its proper divisors (12886739).

64433665 is a wasteful number, since it uses less digits than its factorization.

64433665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12886738.

The product of its digits is 155520, while the sum is 37.

The square root of 64433665 is about 8027.0583030149. The cubic root of 64433665 is about 400.9014357579.

The spelling of 64433665 in words is "sixty-four million, four hundred thirty-three thousand, six hundred sixty-five".