640606222 has 16 divisors (see below), whose sum is σ = 985723200. Its totient is φ = 312053760.

The previous prime is 640606163. The next prime is 640606237. The reversal of 640606222 is 222606046.

It is a super-2 number, since 2×640606222² = 820752663330226568, which contains 22 as substring.

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, 57979 + ... + 68137.

It is an arithmetic number, because the mean of its divisors is an integer number (61607700).

Almost surely, 2^640606222 is an apocalyptic number.

640606222 is a deficient number, since it is larger than the sum of its proper divisors (345116978).

640606222 is a wasteful number, since it uses less digits than its factorization.

640606222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10971.

The product of its (nonzero) digits is 6912, while the sum is 28.

The square root of 640606222 is about 25310.1999597000. The cubic root of 640606222 is about 862.0458871681.

The spelling of 640606222 in words is "six hundred forty million, six hundred six thousand, two hundred twenty-two".