6441894056 has 32 divisors (see below), whose sum is σ = 13122806760. Its totient is φ = 2946865152.

The previous prime is 6441894013. The next prime is 6441894059. The reversal of 6441894056 is 6504981446.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3132193156 + 3309700900 = 55966^2 + 57530^2 .

It is a super-2 number, since 2×6441894056² = 82995998057456262272, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6441894056.

It is not an unprimeable number, because it can be changed into a prime (6441894059) by changing a digit.

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, 262325 + ... + 285828.

Almost surely, 2^6441894056 is an apocalyptic number.

It is an amenable number.

6441894056 is an abundant number, since it is smaller than the sum of its proper divisors (6680912704).

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

6441894056 is a wasteful number, since it uses less digits than its factorization.

6441894056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 548285 (or 548281 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 47.

The square root of 6441894056 is about 80261.4107526151. The cubic root of 6441894056 is about 1860.6778713941.

The spelling of 6441894056 in words is "six billion, four hundred forty-one million, eight hundred ninety-four thousand, fifty-six".