7981135444 has 12 divisors (see below), whose sum is σ = 13983366964. Its totient is φ = 3985887744.

The previous prime is 7981135439. The next prime is 7981135483. The reversal of 7981135444 is 4445311897.

It can be written as a sum of positive squares in 2 ways, for example, as 4766245444 + 3214890000 = 69038^2 + 56700^2 .

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 7981135394 and 7981135403.

It is a congruent number.

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, 1166157 + ... + 1172980.

Almost surely, 2^7981135444 is an apocalyptic number.

It is an amenable number.

7981135444 is a deficient number, since it is larger than the sum of its proper divisors (6002231520).

7981135444 is a wasteful number, since it uses less digits than its factorization.

7981135444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2339994 (or 2339992 counting only the distinct ones).

The product of its digits is 483840, while the sum is 46.

The square root of 7981135444 is about 89337.2007844437. The cubic root of 7981135444 is about 1998.4267163805.

The spelling of 7981135444 in words is "seven billion, nine hundred eighty-one million, one hundred thirty-five thousand, four hundred forty-four".