642994270 has 16 divisors (see below), whose sum is σ = 1168009920. Its totient is φ = 254837664.

The previous prime is 642994259. The next prime is 642994271. The reversal of 642994270 is 72499246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642994271) 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, 293862 + ... + 296041.

It is an arithmetic number, because the mean of its divisors is an integer number (73000620).

Almost surely, 2^642994270 is an apocalyptic number.

642994270 is a deficient number, since it is larger than the sum of its proper divisors (525015650).

642994270 is a wasteful number, since it uses less digits than its factorization.

642994270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 590019.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 642994270 is about 25357.3316813895. The cubic root of 642994270 is about 863.1157353576.

The spelling of 642994270 in words is "six hundred forty-two million, nine hundred ninety-four thousand, two hundred seventy".