642220708 has 12 divisors (see below), whose sum is σ = 1125476380. Its totient is φ = 320656032.

The previous prime is 642220703. The next prime is 642220739. The reversal of 642220708 is 807022246.

It can be written as a sum of positive squares in 2 ways, for example, as 145733184 + 496487524 = 12072^2 + 22282^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 642220708.

It is not an unprimeable number, because it can be changed into a prime (642220703) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110391 + ... + 116062.

Almost surely, 2^642220708 is an apocalyptic number.

It is an amenable number.

642220708 is a deficient number, since it is larger than the sum of its proper divisors (483255672).

642220708 is a wasteful number, since it uses less digits than its factorization.

642220708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227166 (or 227164 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 642220708 is about 25342.0738693580. The cubic root of 642220708 is about 862.7694692006.

The spelling of 642220708 in words is "six hundred forty-two million, two hundred twenty thousand, seven hundred eight".