64664515 has 8 divisors (see below), whose sum is σ = 82162080. Its totient is φ = 48688512.

The previous prime is 64664497. The next prime is 64664539. The reversal of 64664515 is 51546646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64664515 - 2⁹ = 64664003 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 380295 + ... + 380464.

It is an arithmetic number, because the mean of its divisors is an integer number (10270260).

Almost surely, 2^64664515 is an apocalyptic number.

64664515 is a deficient number, since it is larger than the sum of its proper divisors (17497565).

64664515 is a wasteful number, since it uses less digits than its factorization.

64664515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 760781.

The product of its digits is 86400, while the sum is 37.

The square root of 64664515 is about 8041.4249359178. The cubic root of 64664515 is about 401.3796422473.

The spelling of 64664515 in words is "sixty-four million, six hundred sixty-four thousand, five hundred fifteen".