645883118 has 8 divisors (see below), whose sum is σ = 989438112. Its totient is φ = 316070416.

The previous prime is 645883111. The next prime is 645883123. The reversal of 645883118 is 811388546.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645883111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3435455 + ... + 3435642.

It is an arithmetic number, because the mean of its divisors is an integer number (123679764).

Almost surely, 2^645883118 is an apocalyptic number.

645883118 is a deficient number, since it is larger than the sum of its proper divisors (343554994).

645883118 is a wasteful number, since it uses less digits than its factorization.

645883118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6871146.

The product of its digits is 184320, while the sum is 44.

The square root of 645883118 is about 25414.2306198712. The cubic root of 645883118 is about 864.4064079909.

The spelling of 645883118 in words is "six hundred forty-five million, eight hundred eighty-three thousand, one hundred eighteen".