64685975 has 24 divisors (see below), whose sum is σ = 86423040. Its totient is φ = 47869920.

The previous prime is 64685939. The next prime is 64685977. The reversal of 64685975 is 57958646.

It is not a de Polignac number, because 64685975 - 2¹⁰ = 64684951 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64685977) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18842 + ... + 22008.

It is an arithmetic number, because the mean of its divisors is an integer number (3600960).

Almost surely, 2^64685975 is an apocalyptic number.

64685975 is a deficient number, since it is larger than the sum of its proper divisors (21737065).

64685975 is a wasteful number, since it uses less digits than its factorization.

64685975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3239 (or 3234 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 50.

The square root of 64685975 is about 8042.7591658584. The cubic root of 64685975 is about 401.4240388505.

The spelling of 64685975 in words is "sixty-four million, six hundred eighty-five thousand, nine hundred seventy-five".