645416560 has 40 divisors (see below), whose sum is σ = 1588867056. Its totient is φ = 242979840.

The previous prime is 645416537. The next prime is 645416587. The reversal of 645416560 is 65614546.

It is a tau number, because it is divible by the number of its divisors (40).

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, 235926 + ... + 238645.

Almost surely, 2^645416560 is an apocalyptic number.

It is an amenable number.

645416560 is an abundant number, since it is smaller than the sum of its proper divisors (943450496).

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

645416560 is a wasteful number, since it uses less digits than its factorization.

645416560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 474601 (or 474595 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 37.

The square root of 645416560 is about 25405.0498917046. The cubic root of 645416560 is about 864.1982212667.

The spelling of 645416560 in words is "six hundred forty-five million, four hundred sixteen thousand, five hundred sixty".