64624393 has 4 divisors (see below), whose sum is σ = 64718608. Its totient is φ = 64530180.

The previous prime is 64624369. The next prime is 64624423. The reversal of 64624393 is 39342646.

64624393 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64624393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64624303) by changing a digit.

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, 46071 + ... + 47452.

It is an arithmetic number, because the mean of its divisors is an integer number (16179652).

Almost surely, 2^64624393 is an apocalyptic number.

It is an amenable number.

64624393 is a deficient number, since it is larger than the sum of its proper divisors (94215).

64624393 is an equidigital number, since it uses as much as digits as its factorization.

64624393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94214.

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

The square root of 64624393 is about 8038.9298417140. The cubic root of 64624393 is about 401.2966112071.

The spelling of 64624393 in words is "sixty-four million, six hundred twenty-four thousand, three hundred ninety-three".