64987664 has 40 divisors (see below), whose sum is σ = 144359808. Its totient is φ = 27763200.

The previous prime is 64987621. The next prime is 64987669. The reversal of 64987664 is 46678946.

64987664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (64987669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44189 + ... + 45635.

Almost surely, 2^64987664 is an apocalyptic number.

It is an amenable number.

64987664 is an abundant number, since it is smaller than the sum of its proper divisors (79372144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64987664 is a wasteful number, since it uses less digits than its factorization.

64987664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863 (or 1857 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 50.

The square root of 64987664 is about 8061.4926657537. The cubic root of 64987664 is about 402.0471385199.

The spelling of 64987664 in words is "sixty-four million, nine hundred eighty-seven thousand, six hundred sixty-four".