645616300 has 36 divisors (see below), whose sum is σ = 1601130160. Its totient is φ = 221353920.

The previous prime is 645616249. The next prime is 645616331. The reversal of 645616300 is 3616546.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 460455 + ... + 461854.

Almost surely, 2^645616300 is an apocalyptic number.

It is an amenable number.

645616300 is an abundant number, since it is smaller than the sum of its proper divisors (955513860).

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

645616300 is a wasteful number, since it uses less digits than its factorization.

645616300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922330 (or 922323 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 31.

The square root of 645616300 is about 25408.9806958091. The cubic root of 645616300 is about 864.2873611906.

The spelling of 645616300 in words is "six hundred forty-five million, six hundred sixteen thousand, three hundred".