645034768 has 80 divisors (see below), whose sum is σ = 1468905984. Its totient is φ = 268669440.

The previous prime is 645034759. The next prime is 645034823. The reversal of 645034768 is 867430546.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 952446 + ... + 953122.

Almost surely, 2^645034768 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 645034768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (734452992).

645034768 is an abundant number, since it is smaller than the sum of its proper divisors (823871216).

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

645034768 is a wasteful number, since it uses less digits than its factorization.

645034768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920 (or 914 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 43.

The square root of 645034768 is about 25397.5346835082. The cubic root of 645034768 is about 864.0277840288.

The spelling of 645034768 in words is "six hundred forty-five million, thirty-four thousand, seven hundred sixty-eight".