645132680 has 16 divisors (see below), whose sum is σ = 1451548620. Its totient is φ = 258053056.

The previous prime is 645132679. The next prime is 645132713. The reversal of 645132680 is 86231546.

645132680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 615734596 + 29398084 = 24814^2 + 5422^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 645132680.

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, 8064119 + ... + 8064198.

Almost surely, 2^645132680 is an apocalyptic number.

It is an amenable number.

645132680 is an abundant number, since it is smaller than the sum of its proper divisors (806415940).

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

645132680 is a wasteful number, since it uses less digits than its factorization.

645132680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16128328 (or 16128324 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 645132680 is about 25399.4621990309. The cubic root of 645132680 is about 864.0714997128.

The spelling of 645132680 in words is "six hundred forty-five million, one hundred thirty-two thousand, six hundred eighty".