642066222 has 32 divisors (see below), whose sum is σ = 1468334592. Its totient is φ = 183353184.

The previous prime is 642066209. The next prime is 642066223. The reversal of 642066222 is 222660246.

It is a self number, because there is not a number n which added to its sum of digits gives 642066222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642066223) 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, 146223 + ... + 150549.

It is an arithmetic number, because the mean of its divisors is an integer number (45885456).

Almost surely, 2^642066222 is an apocalyptic number.

642066222 is an abundant number, since it is smaller than the sum of its proper divisors (826268370).

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

642066222 is a wasteful number, since it uses less digits than its factorization.

642066222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7872.

The product of its (nonzero) digits is 13824, while the sum is 30.

The square root of 642066222 is about 25339.0256718762. The cubic root of 642066222 is about 862.7002840066.

The spelling of 642066222 in words is "six hundred forty-two million, sixty-six thousand, two hundred twenty-two".