642860020 has 48 divisors (see below), whose sum is σ = 1520257536. Its totient is φ = 226224000.

The previous prime is 642860017. The next prime is 642860027. The reversal of 642860020 is 20068246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642860027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 40311 + ... + 53950.

It is an arithmetic number, because the mean of its divisors is an integer number (31672032).

Almost surely, 2^642860020 is an apocalyptic number.

It is an amenable number.

642860020 is an abundant number, since it is smaller than the sum of its proper divisors (877397516).

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

642860020 is a wasteful number, since it uses less digits than its factorization.

642860020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94312 (or 94310 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 642860020 is about 25354.6843798143. The cubic root of 642860020 is about 863.0556615445.

The spelling of 642860020 in words is "six hundred forty-two million, eight hundred sixty thousand, twenty".