64640764 has 24 divisors (see below), whose sum is σ = 120925728. Its totient is φ = 30159360.

The previous prime is 64640753. The next prime is 64640767. The reversal of 64640764 is 46704646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64640767) 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 7 ways as a sum of consecutive naturals, for example, 4797 + ... + 12340.

It is an arithmetic number, because the mean of its divisors is an integer number (5038572).

Almost surely, 2^64640764 is an apocalyptic number.

It is an amenable number.

64640764 is a deficient number, since it is larger than the sum of its proper divisors (56284964).

64640764 is a wasteful number, since it uses less digits than its factorization.

64640764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17205 (or 17203 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 37.

The square root of 64640764 is about 8039.9480097822. The cubic root of 64640764 is about 401.3304945538.

The spelling of 64640764 in words is "sixty-four million, six hundred forty thousand, seven hundred sixty-four".