642379656 has 32 divisors (see below), whose sum is σ = 1614281760. Its totient is φ = 213015552.

The previous prime is 642379651. The next prime is 642379729. The reversal of 642379656 is 656973246.

642379656 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (642379651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64710 + ... + 73973.

It is an arithmetic number, because the mean of its divisors is an integer number (50446305).

Almost surely, 2^642379656 is an apocalyptic number.

It is an amenable number.

642379656 is an abundant number, since it is smaller than the sum of its proper divisors (971902104).

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

642379656 is a wasteful number, since it uses less digits than its factorization.

642379656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138885 (or 138881 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 48.

The square root of 642379656 is about 25345.2097249165. The cubic root of 642379656 is about 862.8406410828.

The spelling of 642379656 in words is "six hundred forty-two million, three hundred seventy-nine thousand, six hundred fifty-six".