642022022 has 4 divisors (see below), whose sum is σ = 963033036. Its totient is φ = 321011010.

The previous prime is 642022009. The next prime is 642022033. The reversal of 642022022 is 220220246.

It is a semiprime because it is the product of two primes.

It is a junction number, because it is equal to n+sod(n) for n = 642021985 and 642022003.

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 as a sum of consecutive naturals, namely, 160505504 + ... + 160505507.

It is an arithmetic number, because the mean of its divisors is an integer number (240758259).

Almost surely, 2^642022022 is an apocalyptic number.

642022022 is a deficient number, since it is larger than the sum of its proper divisors (321011014).

642022022 is a wasteful number, since it uses less digits than its factorization.

642022022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321011013.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 642022022 is about 25338.1534844195. The cubic root of 642022022 is about 862.6804873842.

Adding to 642022022 its reverse (220220246), we get a palindrome (862242268).

The spelling of 642022022 in words is "six hundred forty-two million, twenty-two thousand, twenty-two".