645410868 has 12 divisors (see below), whose sum is σ = 1505958720. Its totient is φ = 215136952.

The previous prime is 645410833. The next prime is 645410897. The reversal of 645410868 is 868014546.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

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, 26892108 + ... + 26892131.

It is an arithmetic number, because the mean of its divisors is an integer number (125496560).

Almost surely, 2^645410868 is an apocalyptic number.

It is an amenable number.

645410868 is an abundant number, since it is smaller than the sum of its proper divisors (860547852).

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

645410868 is a wasteful number, since it uses less digits than its factorization.

645410868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53784246 (or 53784244 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 42.

The square root of 645410868 is about 25404.9378664857. The cubic root of 645410868 is about 864.1956807727.

The spelling of 645410868 in words is "six hundred forty-five million, four hundred ten thousand, eight hundred sixty-eight".