642797222 has 16 divisors (see below), whose sum is σ = 979340544. Its totient is φ = 316365000.

The previous prime is 642797213. The next prime is 642797269. The reversal of 642797222 is 222797246.

It is a super-2 number, since 2×642797222² = 826376537221834568, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 642797222.

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 in 7 ways as a sum of consecutive naturals, for example, 94847 + ... + 101397.

It is an arithmetic number, because the mean of its divisors is an integer number (61208784).

Almost surely, 2^642797222 is an apocalyptic number.

642797222 is a deficient number, since it is larger than the sum of its proper divisors (336543322).

642797222 is a wasteful number, since it uses less digits than its factorization.

642797222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7315.

The product of its digits is 169344, while the sum is 41.

The square root of 642797222 is about 25353.4459590802. The cubic root of 642797222 is about 863.0275580007.

The spelling of 642797222 in words is "six hundred forty-two million, seven hundred ninety-seven thousand, two hundred twenty-two".