642240444 has 24 divisors (see below), whose sum is σ = 1502484480. Its totient is φ = 213519664.

The previous prime is 642240437. The next prime is 642240449. The reversal of 642240444 is 444042246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642240449) 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, 65274 + ... + 74465.

It is an arithmetic number, because the mean of its divisors is an integer number (62603520).

Almost surely, 2^642240444 is an apocalyptic number.

It is an amenable number.

642240444 is an abundant number, since it is smaller than the sum of its proper divisors (860244036).

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

642240444 is a wasteful number, since it uses less digits than its factorization.

642240444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140129 (or 140127 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 30.

The square root of 642240444 is about 25342.4632583338. The cubic root of 642240444 is about 862.7783069951.

The spelling of 642240444 in words is "six hundred forty-two million, two hundred forty thousand, four hundred forty-four".