642844284 has 24 divisors (see below), whose sum is σ = 1503836880. Its totient is φ = 213729024.

The previous prime is 642844243. The next prime is 642844331. The reversal of 642844284 is 482448246.

It is a happy number.

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 in 7 ways as a sum of consecutive naturals, for example, 64189 + ... + 73524.

It is an arithmetic number, because the mean of its divisors is an integer number (62659870).

Almost surely, 2^642844284 is an apocalyptic number.

It is an amenable number.

642844284 is an abundant number, since it is smaller than the sum of its proper divisors (860992596).

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

642844284 is a wasteful number, since it uses less digits than its factorization.

642844284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138109 (or 138107 counting only the distinct ones).

The product of its digits is 393216, while the sum is 42.

The square root of 642844284 is about 25354.3740605048. The cubic root of 642844284 is about 863.0486194958.

The spelling of 642844284 in words is "six hundred forty-two million, eight hundred forty-four thousand, two hundred eighty-four".