64664505 has 48 divisors (see below), whose sum is σ = 120294720. Its totient is φ = 32033664.

The previous prime is 64664497. The next prime is 64664539. The reversal of 64664505 is 50546646.

It is a happy number.

64664505 is a `hidden beast` number, since 6 + 4 + 6 + 645 + 0 + 5 = 666.

It is not a de Polignac number, because 64664505 - 2³ = 64664497 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64664505.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 44602 + ... + 46028.

It is an arithmetic number, because the mean of its divisors is an integer number (2506140).

Almost surely, 2^64664505 is an apocalyptic number.

It is an amenable number.

64664505 is a deficient number, since it is larger than the sum of its proper divisors (55630215).

64664505 is a wasteful number, since it uses less digits than its factorization.

64664505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510 (or 1507 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 64664505 is about 8041.4243141374. The cubic root of 64664505 is about 401.3796215569.

The spelling of 64664505 in words is "sixty-four million, six hundred sixty-four thousand, five hundred five".