645539584 has 36 divisors (see below), whose sum is σ = 1306246816. Its totient is φ = 318339072.

The previous prime is 645539579. The next prime is 645539593. The reversal of 645539584 is 485935546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1417 + ... + 35959.

Almost surely, 2^645539584 is an apocalyptic number.

645539584 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645539584, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (653123408).

645539584 is an abundant number, since it is smaller than the sum of its proper divisors (660707232).

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

645539584 is an equidigital number, since it uses as much as digits as its factorization.

645539584 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34632 (or 34618 counting only the distinct ones).

The product of its digits is 2592000, while the sum is 49.

The square root of 645539584 is about 25407.4710272392. The cubic root of 645539584 is about 864.2531265657.

The spelling of 645539584 in words is "six hundred forty-five million, five hundred thirty-nine thousand, five hundred eighty-four".