79981844 has 6 divisors (see below), whose sum is σ = 139968234. Its totient is φ = 39990920.

The previous prime is 79981843. The next prime is 79981877. The reversal of 79981844 is 44818997.

It can be written as a sum of positive squares in only one way, i.e., 50410000 + 29571844 = 7100^2 + 5438^2 .

It is a junction number, because it is equal to n+sod(n) for n = 79981792 and 79981801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79981841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9997727 + ... + 9997734.

It is an arithmetic number, because the mean of its divisors is an integer number (23328039).

Almost surely, 2^79981844 is an apocalyptic number.

It is an amenable number.

79981844 is a deficient number, since it is larger than the sum of its proper divisors (59986390).

79981844 is a wasteful number, since it uses less digits than its factorization.

79981844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19995465 (or 19995463 counting only the distinct ones).

The product of its digits is 580608, while the sum is 50.

The square root of 79981844 is about 8943.2569011518. The cubic root of 79981844 is about 430.8543389433.

The spelling of 79981844 in words is "seventy-nine million, nine hundred eighty-one thousand, eight hundred forty-four".