642712022 has 16 divisors (see below), whose sum is σ = 978676992. Its totient is φ = 316496040.

The previous prime is 642712003. The next prime is 642712027. The reversal of 642712022 is 220217246.

It is a junction number, because it is equal to n+sod(n) for n = 642711982 and 642712000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642712027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 183863 + ... + 187325.

It is an arithmetic number, because the mean of its divisors is an integer number (61167312).

Almost surely, 2^642712022 is an apocalyptic number.

642712022 is a deficient number, since it is larger than the sum of its proper divisors (335964970).

642712022 is a wasteful number, since it uses less digits than its factorization.

642712022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4843.

The product of its (nonzero) digits is 2688, while the sum is 26.

The square root of 642712022 is about 25351.7656584310. The cubic root of 642712022 is about 862.9894261221.

Adding to 642712022 its reverse (220217246), we get a palindrome (862929268).

The spelling of 642712022 in words is "six hundred forty-two million, seven hundred twelve thousand, twenty-two".