642260404 has 6 divisors (see below), whose sum is σ = 1123955714. Its totient is φ = 321130200.

The previous prime is 642260389. The next prime is 642260429. The reversal of 642260404 is 404062246.

It can be written as a sum of positive squares in only one way, i.e., 462164004 + 180096400 = 21498^2 + 13420^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80282547 + ... + 80282554.

Almost surely, 2^642260404 is an apocalyptic number.

It is an amenable number.

642260404 is a deficient number, since it is larger than the sum of its proper divisors (481695310).

642260404 is a wasteful number, since it uses less digits than its factorization.

642260404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160565105 (or 160565103 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 642260404 is about 25342.8570607183. The cubic root of 642260404 is about 862.7872449127.

The spelling of 642260404 in words is "six hundred forty-two million, two hundred sixty thousand, four hundred four".