645360320 has 112 divisors (see below), whose sum is σ = 1689811200. Its totient is φ = 232811520.

The previous prime is 645360293. The next prime is 645360343. The reversal of 645360320 is 23063546.

645360320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 488621 + ... + 489939.

It is an arithmetic number, because the mean of its divisors is an integer number (15087600).

Almost surely, 2^645360320 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 645360320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (844905600).

645360320 is an abundant number, since it is smaller than the sum of its proper divisors (1044450880).

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

645360320 is a wasteful number, since it uses less digits than its factorization.

645360320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486 (or 1476 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 29.

The square root of 645360320 is about 25403.9430010382. The cubic root of 645360320 is about 864.1731191736.

The spelling of 645360320 in words is "six hundred forty-five million, three hundred sixty thousand, three hundred twenty".