645410680 has 32 divisors (see below), whose sum is σ = 1479578400. Its totient is φ = 253292416.

The previous prime is 645410671. The next prime is 645410681. The reversal of 645410680 is 86014546.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645410681) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 150100 + ... + 154339.

It is an arithmetic number, because the mean of its divisors is an integer number (46236825).

Almost surely, 2^645410680 is an apocalyptic number.

It is an amenable number.

645410680 is an abundant number, since it is smaller than the sum of its proper divisors (834167720).

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

645410680 is a wasteful number, since it uses less digits than its factorization.

645410680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304503 (or 304499 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 645410680 is about 25404.9341664174. The cubic root of 645410680 is about 864.1955968630.

The spelling of 645410680 in words is "six hundred forty-five million, four hundred ten thousand, six hundred eighty".