664010638 has 12 divisors (see below), whose sum is σ = 1029184920. Its totient is φ = 321294540.

The previous prime is 664010617. The next prime is 664010647. The reversal of 664010638 is 836010466.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 170818 + ... + 174661.

It is an arithmetic number, because the mean of its divisors is an integer number (85765410).

Almost surely, 2^664010638 is an apocalyptic number.

664010638 is a deficient number, since it is larger than the sum of its proper divisors (365174282).

664010638 is a wasteful number, since it uses less digits than its factorization.

664010638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345543 (or 345512 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 664010638 is about 25768.4038698558. The cubic root of 664010638 is about 872.4187932729.

The spelling of 664010638 in words is "six hundred sixty-four million, ten thousand, six hundred thirty-eight".