642839910 has 16 divisors (see below), whose sum is σ = 1542815856. Its totient is φ = 171423968.

The previous prime is 642839891. The next prime is 642839927. The reversal of 642839910 is 19938246.

642839910 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, 10713969 + ... + 10714028.

It is an arithmetic number, because the mean of its divisors is an integer number (96425991).

Almost surely, 2^642839910 is an apocalyptic number.

642839910 is an abundant number, since it is smaller than the sum of its proper divisors (899975946).

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

642839910 is a wasteful number, since it uses less digits than its factorization.

642839910 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21428007.

The product of its (nonzero) digits is 93312, while the sum is 42.

The square root of 642839910 is about 25354.2878030522. The cubic root of 642839910 is about 863.0466620580.

The spelling of 642839910 in words is "six hundred forty-two million, eight hundred thirty-nine thousand, nine hundred ten".