645888022 has 8 divisors (see below), whose sum is σ = 1043357616. Its totient is φ = 298102152.

The previous prime is 645888011. The next prime is 645888043. The reversal of 645888022 is 220888546.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 645888022.

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 3 ways as a sum of consecutive naturals, for example, 12420898 + ... + 12420949.

It is an arithmetic number, because the mean of its divisors is an integer number (130419702).

Almost surely, 2^645888022 is an apocalyptic number.

645888022 is a deficient number, since it is larger than the sum of its proper divisors (397469594).

645888022 is a wasteful number, since it uses less digits than its factorization.

645888022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24841862.

The product of its (nonzero) digits is 245760, while the sum is 43.

The square root of 645888022 is about 25414.3271010664. The cubic root of 645888022 is about 864.4085957130.

The spelling of 645888022 in words is "six hundred forty-five million, eight hundred eighty-eight thousand, twenty-two".