645018860 has 24 divisors (see below), whose sum is σ = 1398235776. Its totient is φ = 249684480.

The previous prime is 645018839. The next prime is 645018919. The reversal of 645018860 is 68810546.

645018860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519557 + ... + 520796.

It is an arithmetic number, because the mean of its divisors is an integer number (58259824).

Almost surely, 2^645018860 is an apocalyptic number.

It is an amenable number.

645018860 is an abundant number, since it is smaller than the sum of its proper divisors (753216916).

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

645018860 is a wasteful number, since it uses less digits than its factorization.

645018860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1040393 (or 1040391 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 38.

The square root of 645018860 is about 25397.2215015737. The cubic root of 645018860 is about 864.0206810179.

The spelling of 645018860 in words is "six hundred forty-five million, eighteen thousand, eight hundred sixty".