645011144 has 64 divisors (see below), whose sum is σ = 1319276160. Its totient is φ = 294497280.

The previous prime is 645011117. The next prime is 645011173. The reversal of 645011144 is 441110546.

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, 646454 + ... + 647450.

It is an arithmetic number, because the mean of its divisors is an integer number (20613690).

Almost surely, 2^645011144 is an apocalyptic number.

It is an amenable number.

645011144 is an abundant number, since it is smaller than the sum of its proper divisors (674265016).

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

645011144 is a wasteful number, since it uses less digits than its factorization.

645011144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158 (or 1154 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 645011144 is about 25397.0695947387. The cubic root of 645011144 is about 864.0172357387.

The spelling of 645011144 in words is "six hundred forty-five million, eleven thousand, one hundred forty-four".