645160000 has 105 divisors (see below), whose sum is σ = 1612483059. Its totient is φ = 256032000.

The previous prime is 645159971. The next prime is 645160007. The reversal of 645160000 is 61546.

The square root of 645160000 is 25400.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 2 ways, for example, as 50580544 + 594579456 = 7112^2 + 24384^2 .

It is not an unprimeable number, because it can be changed into a prime (645160007) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 5079937 + ... + 5080063.

Almost surely, 2^645160000 is an apocalyptic number.

645160000 is the 25400-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 645160000

645160000 is an abundant number, since it is smaller than the sum of its proper divisors (967323059).

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

645160000 is an frugal number, since it uses more digits than its factorization.

645160000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 286 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 22.

The cubic root of 645160000 is about 864.0836967388.

The spelling of 645160000 in words is "six hundred forty-five million, one hundred sixty thousand".