642204404 has 6 divisors (see below), whose sum is σ = 1123857714. Its totient is φ = 321102200.

The previous prime is 642204349. The next prime is 642204419. The reversal of 642204404 is 404402246.

It can be written as a sum of positive squares in only one way, i.e., 642115600 + 88804 = 25340^2 + 298^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80275547 + ... + 80275554.

It is an arithmetic number, because the mean of its divisors is an integer number (187309619).

Almost surely, 2^642204404 is an apocalyptic number.

It is an amenable number.

642204404 is a deficient number, since it is larger than the sum of its proper divisors (481653310).

642204404 is a wasteful number, since it uses less digits than its factorization.

642204404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160551105 (or 160551103 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 26.

The square root of 642204404 is about 25341.7521888286. The cubic root of 642204404 is about 862.7621681216.

The spelling of 642204404 in words is "six hundred forty-two million, two hundred four thousand, four hundred four".