645392484 has 72 divisors (see below), whose sum is σ = 1782668160. Its totient is φ = 195249600.

The previous prime is 645392483. The next prime is 645392491. The reversal of 645392484 is 484293546.

It is not an unprimeable number, because it can be changed into a prime (645392483) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 359862 + ... + 361650.

It is an arithmetic number, because the mean of its divisors is an integer number (24759280).

Almost surely, 2^645392484 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 645392484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (891334080).

645392484 is an abundant number, since it is smaller than the sum of its proper divisors (1137275676).

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

645392484 is a wasteful number, since it uses less digits than its factorization.

645392484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2721 (or 2716 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 645392484 is about 25404.5760444846. The cubic root of 645392484 is about 864.1874753927.

It can be divided in two parts, 645 and 392484, that added together give a square (393129 = 627²).

The spelling of 645392484 in words is "six hundred forty-five million, three hundred ninety-two thousand, four hundred eighty-four".