64695975 has 24 divisors (see below), whose sum is σ = 107208912. Its totient is φ = 34425600.

The previous prime is 64695973. The next prime is 64695979. The reversal of 64695975 is 57959646.

It is not a de Polignac number, because 64695975 - 2¹ = 64695973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64695971) 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, 48315 + ... + 49635.

It is an arithmetic number, because the mean of its divisors is an integer number (4467038).

Almost surely, 2^64695975 is an apocalyptic number.

64695975 is a deficient number, since it is larger than the sum of its proper divisors (42512937).

64695975 is a wasteful number, since it uses less digits than its factorization.

64695975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1987 (or 1982 counting only the distinct ones).

The product of its digits is 2041200, while the sum is 51.

The square root of 64695975 is about 8043.3808190337. The cubic root of 64695975 is about 401.4447235690. Note that the first 3 decimals are identical.

The spelling of 64695975 in words is "sixty-four million, six hundred ninety-five thousand, nine hundred seventy-five".