642604806 has 16 divisors (see below), whose sum is σ = 1428010800. Its totient is φ = 214201584.

The previous prime is 642604783. The next prime is 642604861. The reversal of 642604806 is 608406246.

It is a happy number.

642604806 is a `hidden beast` number, since 6 + 42 + 604 + 8 + 0 + 6 = 666.

642604806 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5949991 + ... + 5950098.

It is an arithmetic number, because the mean of its divisors is an integer number (89250675).

Almost surely, 2^642604806 is an apocalyptic number.

642604806 is an abundant number, since it is smaller than the sum of its proper divisors (785405994).

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

642604806 is a wasteful number, since it uses less digits than its factorization.

642604806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11900100 (or 11900094 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 642604806 is about 25349.6510035148. The cubic root of 642604806 is about 862.9414360339.

The spelling of 642604806 in words is "six hundred forty-two million, six hundred four thousand, eight hundred six".