642426022 has 16 divisors (see below), whose sum is σ = 1166084640. Its totient is φ = 259129728.

The previous prime is 642426011. The next prime is 642426023. The reversal of 642426022 is 220624246.

It is a super-2 number, since 2×642426022² = 825422387485488968, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642426023) by changing a digit.

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, 1349397 + ... + 1349872.

It is an arithmetic number, because the mean of its divisors is an integer number (72880290).

Almost surely, 2^642426022 is an apocalyptic number.

642426022 is a deficient number, since it is larger than the sum of its proper divisors (523658618).

642426022 is a wasteful number, since it uses less digits than its factorization.

642426022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2699295.

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 642426022 is about 25346.1243980219. The cubic root of 642426022 is about 862.8614000977.

The spelling of 642426022 in words is "six hundred forty-two million, four hundred twenty-six thousand, twenty-two".