6644452240 has 20 divisors (see below), whose sum is σ = 15448351644. Its totient is φ = 2657780864.

The previous prime is 6644452207. The next prime is 6644452259. The reversal of 6644452240 is 422544466.

It can be written as a sum of positive squares in 2 ways, for example, as 3895757056 + 2748695184 = 62416^2 + 52428^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a self number, because there is not a number n which added to its sum of digits gives 6644452240.

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, 41527747 + ... + 41527906.

Almost surely, 2^6644452240 is an apocalyptic number.

It is an amenable number.

6644452240 is an abundant number, since it is smaller than the sum of its proper divisors (8803899404).

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

6644452240 is a wasteful number, since it uses less digits than its factorization.

6644452240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83055666 (or 83055660 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 37.

The square root of 6644452240 is about 81513.5095551651. The cubic root of 6644452240 is about 1879.9792739529.

The spelling of 6644452240 in words is "six billion, six hundred forty-four million, four hundred fifty-two thousand, two hundred forty".