645683022 has 32 divisors (see below), whose sum is σ = 1449655200. Its totient is φ = 213007104.

The previous prime is 645682993. The next prime is 645683033. The reversal of 645683022 is 220386546.

645683022 is a `hidden beast` number, since 64 + 568 + 30 + 2 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56397 + ... + 66872.

It is an arithmetic number, because the mean of its divisors is an integer number (45301725).

Almost surely, 2^645683022 is an apocalyptic number.

645683022 is an abundant number, since it is smaller than the sum of its proper divisors (803972178).

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

645683022 is a wasteful number, since it uses less digits than its factorization.

645683022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123377 (or 123371 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 645683022 is about 25410.2936228608. The cubic root of 645683022 is about 864.3171337738.

The spelling of 645683022 in words is "six hundred forty-five million, six hundred eighty-three thousand, twenty-two".