645685614 has 32 divisors (see below), whose sum is σ = 1639837440. Its totient is φ = 184481496.

The previous prime is 645685613. The next prime is 645685643. The reversal of 645685614 is 416586546.

It is a self number, because there is not a number n which added to its sum of digits gives 645685614.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645685613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 853704 + ... + 854459.

It is an arithmetic number, because the mean of its divisors is an integer number (51244920).

Almost surely, 2^645685614 is an apocalyptic number.

645685614 is an abundant number, since it is smaller than the sum of its proper divisors (994151826).

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

645685614 is a wasteful number, since it uses less digits than its factorization.

645685614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1708181 (or 1708175 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 645685614 is about 25410.3446257622. The cubic root of 645685614 is about 864.3182903304.

The spelling of 645685614 in words is "six hundred forty-five million, six hundred eighty-five thousand, six hundred fourteen".