64605975 has 24 divisors (see below), whose sum is σ = 122075520. Its totient is φ = 29533920.

The previous prime is 64605973. The next prime is 64605991. The reversal of 64605975 is 57950646.

It is not a de Polignac number, because 64605975 - 2¹ = 64605973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64605973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61005 + ... + 62054.

It is an arithmetic number, because the mean of its divisors is an integer number (5086480).

Almost surely, 2^64605975 is an apocalyptic number.

64605975 is a deficient number, since it is larger than the sum of its proper divisors (57469545).

64605975 is a wasteful number, since it uses less digits than its factorization.

64605975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123079 (or 123074 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 64605975 is about 8037.7842095941. The cubic root of 64605975 is about 401.2584843074.

The spelling of 64605975 in words is "sixty-four million, six hundred five thousand, nine hundred seventy-five".