642870678 has 16 divisors (see below), whose sum is σ = 1286495856. Its totient is φ = 214164480.

The previous prime is 642870661. The next prime is 642870703. The reversal of 642870678 is 876078246.

642870678 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, 20043 + ... + 41078.

It is an arithmetic number, because the mean of its divisors is an integer number (80405991).

Almost surely, 2^642870678 is an apocalyptic number.

642870678 is an abundant number, since it is smaller than the sum of its proper divisors (643625178).

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

642870678 is a wasteful number, since it uses less digits than its factorization.

642870678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62879.

The product of its (nonzero) digits is 903168, while the sum is 48.

The square root of 642870678 is about 25354.8945570673. The cubic root of 642870678 is about 863.0604310621.

The spelling of 642870678 in words is "six hundred forty-two million, eight hundred seventy thousand, six hundred seventy-eight".