4000644260 has 24 divisors (see below), whose sum is σ = 8443579200. Its totient is φ = 1592214624.

The previous prime is 4000644259. The next prime is 4000644281. The reversal of 4000644260 is 624460004.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 498614 + ... + 506573.

It is an arithmetic number, because the mean of its divisors is an integer number (351815800).

Almost surely, 2^4000644260 is an apocalyptic number.

It is an amenable number.

4000644260 is an abundant number, since it is smaller than the sum of its proper divisors (4442934940).

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

4000644260 is a wasteful number, since it uses less digits than its factorization.

4000644260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1005395 (or 1005393 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 4000644260 is about 63250.6463208085. The cubic root of 4000644260 is about 1587.4862723098.

The spelling of 4000644260 in words is "four billion, six hundred forty-four thousand, two hundred sixty".