645297860 has 24 divisors (see below), whose sum is σ = 1398840576. Its totient is φ = 249792480.

The previous prime is 645297857. The next prime is 645297869. The reversal of 645297860 is 68792546.

It is not an unprimeable number, because it can be changed into a prime (645297869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 519782 + ... + 521021.

It is an arithmetic number, because the mean of its divisors is an integer number (58285024).

Almost surely, 2^645297860 is an apocalyptic number.

It is an amenable number.

645297860 is an abundant number, since it is smaller than the sum of its proper divisors (753542716).

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

645297860 is a wasteful number, since it uses less digits than its factorization.

645297860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1040843 (or 1040841 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 47.

The square root of 645297860 is about 25402.7136345706. The cubic root of 645297860 is about 864.1452391440.

The spelling of 645297860 in words is "six hundred forty-five million, two hundred ninety-seven thousand, eight hundred sixty".