64644675 has 12 divisors (see below), whose sum is σ = 106879320. Its totient is φ = 34477120.

The previous prime is 64644649. The next prime is 64644677. The reversal of 64644675 is 57644646.

It is a happy number.

It is not a de Polignac number, because 64644675 - 2²¹ = 62547523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64644677) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 430890 + ... + 431039.

It is an arithmetic number, because the mean of its divisors is an integer number (8906610).

Almost surely, 2^64644675 is an apocalyptic number.

64644675 is a deficient number, since it is larger than the sum of its proper divisors (42234645).

64644675 is a wasteful number, since it uses less digits than its factorization.

64644675 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861942 (or 861937 counting only the distinct ones).

The product of its digits is 483840, while the sum is 42.

The square root of 64644675 is about 8040.1912290691. The cubic root of 64644675 is about 401.3385883727.

The spelling of 64644675 in words is "sixty-four million, six hundred forty-four thousand, six hundred seventy-five".