64623439 has 4 divisors (see below), whose sum is σ = 64756624. Its totient is φ = 64490256.

The previous prime is 64623431. The next prime is 64623509. The reversal of 64623439 is 93432646.

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 64623439 - 2³ = 64623431 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64623398 and 64623407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64623431) 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, 65862 + ... + 66835.

It is an arithmetic number, because the mean of its divisors is an integer number (16189156).

Almost surely, 2^64623439 is an apocalyptic number.

64623439 is a deficient number, since it is larger than the sum of its proper divisors (133185).

64623439 is a wasteful number, since it uses less digits than its factorization.

64623439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133184.

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

The square root of 64623439 is about 8038.8705052389. The cubic root of 64623439 is about 401.2946365200.

The spelling of 64623439 in words is "sixty-four million, six hundred twenty-three thousand, four hundred thirty-nine".