642635006 has 24 divisors (see below), whose sum is σ = 1053443160. Its totient is φ = 293862816.

The previous prime is 642634963. The next prime is 642635033. The reversal of 642635006 is 600536246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28121 + ... + 45563.

It is an arithmetic number, because the mean of its divisors is an integer number (43893465).

Almost surely, 2^642635006 is an apocalyptic number.

642635006 is a deficient number, since it is larger than the sum of its proper divisors (410808154).

642635006 is a wasteful number, since it uses less digits than its factorization.

642635006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17580 (or 17567 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 642635006 is about 25350.2466654666. The cubic root of 642635006 is about 862.9549541521.

The spelling of 642635006 in words is "six hundred forty-two million, six hundred thirty-five thousand, six".