642171882 has 128 divisors (see below), whose sum is σ = 1526169600. Its totient is φ = 178214400.

The previous prime is 642171863. The next prime is 642171883. The reversal of 642171882 is 288171246.

It is a happy number.

642171882 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 642171882.

It is not an unprimeable number, because it can be changed into a prime (642171883) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4687318 + ... + 4687454.

It is an arithmetic number, because the mean of its divisors is an integer number (11923200).

Almost surely, 2^642171882 is an apocalyptic number.

642171882 is a gapful number since it is divisible by the number (62) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 642171882, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (763084800).

642171882 is an abundant number, since it is smaller than the sum of its proper divisors (883997718).

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

642171882 is a wasteful number, since it uses less digits than its factorization.

642171882 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292.

The product of its digits is 43008, while the sum is 39.

The square root of 642171882 is about 25341.1105123671. The cubic root of 642171882 is about 862.7476041060.

The spelling of 642171882 in words is "six hundred forty-two million, one hundred seventy-one thousand, eight hundred eighty-two".