645932560 has 160 divisors (see below), whose sum is σ = 1872380160. Its totient is φ = 201775104.

The previous prime is 645932537. The next prime is 645932659. The reversal of 645932560 is 65239546.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 603706 + ... + 604774.

It is an arithmetic number, because the mean of its divisors is an integer number (11702376).

Almost surely, 2^645932560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645932560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (936190080).

645932560 is an abundant number, since it is smaller than the sum of its proper divisors (1226447600).

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

645932560 is a wasteful number, since it uses less digits than its factorization.

645932560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1185 (or 1179 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 645932560 is about 25415.2033239949. The cubic root of 645932560 is about 864.4284640410.

The spelling of 645932560 in words is "six hundred forty-five million, nine hundred thirty-two thousand, five hundred sixty".