6440000056 has 32 divisors (see below), whose sum is σ = 13831488000. Its totient is φ = 2753702496.

The previous prime is 6440000051. The next prime is 6440000081. The reversal of 6440000056 is 6500000446.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6440000051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106396 + ... + 155563.

It is an arithmetic number, because the mean of its divisors is an integer number (432234000).

Almost surely, 2^6440000056 is an apocalyptic number.

It is an amenable number.

6440000056 is an abundant number, since it is smaller than the sum of its proper divisors (7391487944).

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

6440000056 is a wasteful number, since it uses less digits than its factorization.

6440000056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262411 (or 262407 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 6440000056 is about 80249.6109398669. The cubic root of 6440000056 is about 1860.4954990828.

The spelling of 6440000056 in words is "six billion, four hundred forty million, fifty-six", and thus it is an aban number.