645298464 has 24 divisors (see below), whose sum is σ = 1693908720. Its totient is φ = 215099456.

The previous prime is 645298447. The next prime is 645298469. The reversal of 645298464 is 464892546.

It is a tau number, because it is divible by the number of its divisors (24).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (645298469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3360834 + ... + 3361025.

It is an arithmetic number, because the mean of its divisors is an integer number (70579530).

Almost surely, 2^645298464 is an apocalyptic number.

It is an amenable number.

645298464 is an abundant number, since it is smaller than the sum of its proper divisors (1048610256).

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

645298464 is a wasteful number, since it uses less digits than its factorization.

645298464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6721872 (or 6721864 counting only the distinct ones).

The product of its digits is 1658880, while the sum is 48.

The square root of 645298464 is about 25402.7255230615. The cubic root of 645298464 is about 864.1455087578.

The spelling of 645298464 in words is "six hundred forty-five million, two hundred ninety-eight thousand, four hundred sixty-four".