645465560 has 32 divisors (see below), whose sum is σ = 1515443040. Its totient is φ = 246960384.

The previous prime is 645465553. The next prime is 645465563. The reversal of 645465560 is 65564546.

It is a super-2 number, since 2×645465560² = 833251578292227200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645465563) 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, 349877 + ... + 351716.

It is an arithmetic number, because the mean of its divisors is an integer number (47357595).

Almost surely, 2^645465560 is an apocalyptic number.

It is an amenable number.

645465560 is an abundant number, since it is smaller than the sum of its proper divisors (869977480).

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

645465560 is a wasteful number, since it uses less digits than its factorization.

645465560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 701627 (or 701623 counting only the distinct ones).

The product of its (nonzero) digits is 432000, while the sum is 41.

The square root of 645465560 is about 25406.0142485987. The cubic root of 645465560 is about 864.2200906784.

The spelling of 645465560 in words is "six hundred forty-five million, four hundred sixty-five thousand, five hundred sixty".