642243344 has 20 divisors (see below), whose sum is σ = 1270823424. Its totient is φ = 314288928.

The previous prime is 642243331. The next prime is 642243359. The reversal of 642243344 is 443342246.

It is a self number, because there is not a number n which added to its sum of digits gives 642243344.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426272 + ... + 427775.

Almost surely, 2^642243344 is an apocalyptic number.

It is an amenable number.

642243344 is a deficient number, since it is larger than the sum of its proper divisors (628580080).

642243344 is a wasteful number, since it uses less digits than its factorization.

642243344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 854102 (or 854096 counting only the distinct ones).

The product of its digits is 55296, while the sum is 32.

The square root of 642243344 is about 25342.5204744911. The cubic root of 642243344 is about 862.7796056018.

The spelling of 642243344 in words is "six hundred forty-two million, two hundred forty-three thousand, three hundred forty-four".