681479444 has 6 divisors (see below), whose sum is σ = 1192589034. Its totient is φ = 340739720.

The previous prime is 681479429. The next prime is 681479467. The reversal of 681479444 is 444974186.

It can be written as a sum of positive squares in only one way, i.e., 343360900 + 338118544 = 18530^2 + 18388^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85184927 + ... + 85184934.

It is an arithmetic number, because the mean of its divisors is an integer number (198764839).

Almost surely, 2^681479444 is an apocalyptic number.

It is an amenable number.

681479444 is a deficient number, since it is larger than the sum of its proper divisors (511109590).

681479444 is a wasteful number, since it uses less digits than its factorization.

681479444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170369865 (or 170369863 counting only the distinct ones).

The product of its digits is 774144, while the sum is 47.

The square root of 681479444 is about 26105.1612521356. The cubic root of 681479444 is about 880.0032041894.

The spelling of 681479444 in words is "six hundred eighty-one million, four hundred seventy-nine thousand, four hundred forty-four".