642912140 has 48 divisors (see below), whose sum is σ = 1456240800. Its totient is φ = 237012480.

The previous prime is 642912119. The next prime is 642912157. The reversal of 642912140 is 41219246.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209336 + ... + 212384.

It is an arithmetic number, because the mean of its divisors is an integer number (30338350).

Almost surely, 2^642912140 is an apocalyptic number.

It is an amenable number.

642912140 is an abundant number, since it is smaller than the sum of its proper divisors (813328660).

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

642912140 is a wasteful number, since it uses less digits than its factorization.

642912140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3882 (or 3880 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 29.

The square root of 642912140 is about 25355.7121769435. The cubic root of 642912140 is about 863.0789850489.

The spelling of 642912140 in words is "six hundred forty-two million, nine hundred twelve thousand, one hundred forty".