64642339 has 4 divisors (see below), whose sum is σ = 64756120. Its totient is φ = 64528560.

The previous prime is 64642321. The next prime is 64642379. The reversal of 64642339 is 93324646.

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

It is a cyclic number.

It is not a de Polignac number, because 64642339 - 2⁵ = 64642307 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64642298 and 64642307.

It is not an unprimeable number, because it can be changed into a prime (64642379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56034 + ... + 57175.

It is an arithmetic number, because the mean of its divisors is an integer number (16189030).

Almost surely, 2^64642339 is an apocalyptic number.

64642339 is a deficient number, since it is larger than the sum of its proper divisors (113781).

64642339 is a wasteful number, since it uses less digits than its factorization.

64642339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113780.

The product of its digits is 93312, while the sum is 37.

The square root of 64642339 is about 8040.0459575801. The cubic root of 64642339 is about 401.3337540573. Note that the first 3 decimals are identical.

The spelling of 64642339 in words is "sixty-four million, six hundred forty-two thousand, three hundred thirty-nine".