64438785 has 24 divisors (see below), whose sum is σ = 117574080. Its totient is φ = 32558112.

The previous prime is 64438771. The next prime is 64438807. The reversal of 64438785 is 58783446.

It is not a de Polignac number, because 64438785 - 2⁸ = 64438529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 64438785.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 36829 + ... + 38538.

It is an arithmetic number, because the mean of its divisors is an integer number (4898920).

Almost surely, 2^64438785 is an apocalyptic number.

It is an amenable number.

64438785 is a deficient number, since it is larger than the sum of its proper divisors (53135295).

64438785 is a wasteful number, since it uses less digits than its factorization.

64438785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75397 (or 75394 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The square root of 64438785 is about 8027.3772179959. The cubic root of 64438785 is about 400.9120542288.

The spelling of 64438785 in words is "sixty-four million, four hundred thirty-eight thousand, seven hundred eighty-five".