642343022 has 4 divisors (see below), whose sum is σ = 963514536. Its totient is φ = 321171510.

The previous prime is 642343007. The next prime is 642343063. The reversal of 642343022 is 220343246.

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 = 642342982 and 642343000.

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, 160585754 + ... + 160585757.

It is an arithmetic number, because the mean of its divisors is an integer number (240878634).

Almost surely, 2^642343022 is an apocalyptic number.

642343022 is a deficient number, since it is larger than the sum of its proper divisors (321171514).

642343022 is a wasteful number, since it uses less digits than its factorization.

642343022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321171513.

The product of its (nonzero) digits is 6912, while the sum is 26.

The square root of 642343022 is about 25344.4870139445. The cubic root of 642343022 is about 862.8242385786.

Adding to 642343022 its reverse (220343246), we get a palindrome (862686268).

The spelling of 642343022 in words is "six hundred forty-two million, three hundred forty-three thousand, twenty-two".