642720948 has 48 divisors (see below), whose sum is σ = 1523094720. Its totient is φ = 210921984.

The previous prime is 642720941. The next prime is 642720959. The reversal of 642720948 is 849027246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642720941) 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, 211383 + ... + 214401.

It is an arithmetic number, because the mean of its divisors is an integer number (31731140).

Almost surely, 2^642720948 is an apocalyptic number.

It is an amenable number.

642720948 is an abundant number, since it is smaller than the sum of its proper divisors (880373772).

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

642720948 is a wasteful number, since it uses less digits than its factorization.

642720948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3296 (or 3294 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 642720948 is about 25351.9417007850. The cubic root of 642720948 is about 862.9934211762.

The spelling of 642720948 in words is "six hundred forty-two million, seven hundred twenty thousand, nine hundred forty-eight".