642172422 has 32 divisors (see below), whose sum is σ = 1334237184. Its totient is φ = 205889600.

The previous prime is 642172417. The next prime is 642172429. The reversal of 642172422 is 224271246.

It is a self number, because there is not a number n which added to its sum of digits gives 642172422.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642172429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 918 + ... + 35849.

It is an arithmetic number, because the mean of its divisors is an integer number (41694912).

Almost surely, 2^642172422 is an apocalyptic number.

642172422 is an abundant number, since it is smaller than the sum of its proper divisors (692064762).

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

642172422 is a wasteful number, since it uses less digits than its factorization.

642172422 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36884.

The product of its digits is 10752, while the sum is 30.

The square root of 642172422 is about 25341.1211669886. The cubic root of 642172422 is about 862.7478459330.

The spelling of 642172422 in words is "six hundred forty-two million, one hundred seventy-two thousand, four hundred twenty-two".