642440244 has 24 divisors (see below), whose sum is σ = 1510473888. Its totient is φ = 212511520.

The previous prime is 642440231. The next prime is 642440263. The reversal of 642440244 is 442044246.

It is a super-2 number, since 2×642440244² = 825458934221559072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 202767 + ... + 205910.

It is an arithmetic number, because the mean of its divisors is an integer number (62936412).

Almost surely, 2^642440244 is an apocalyptic number.

It is an amenable number.

642440244 is an abundant number, since it is smaller than the sum of its proper divisors (868033644).

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

642440244 is a wasteful number, since it uses less digits than its factorization.

642440244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408815 (or 408813 counting only the distinct ones).

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

The square root of 642440244 is about 25346.4049521821. The cubic root of 642440244 is about 862.8677673804.

The spelling of 642440244 in words is "six hundred forty-two million, four hundred forty thousand, two hundred forty-four".