81799196 has 12 divisors (see below), whose sum is σ = 143268048. Its totient is φ = 40865472.

The previous prime is 81799187. The next prime is 81799213. The reversal of 81799196 is 69199718.

It is a super-2 number, since 2×81799196² = 13382216932492832, which contains 22 as substring.

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, 2696 + ... + 13071.

It is an arithmetic number, because the mean of its divisors is an integer number (11939004).

Almost surely, 2^81799196 is an apocalyptic number.

It is an amenable number.

81799196 is a deficient number, since it is larger than the sum of its proper divisors (61468852).

81799196 is a wasteful number, since it uses less digits than its factorization.

81799196 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17068 (or 17066 counting only the distinct ones).

The product of its digits is 244944, while the sum is 50.

The square root of 81799196 is about 9044.2907958557. The cubic root of 81799196 is about 434.0932289259.

The spelling of 81799196 in words is "eighty-one million, seven hundred ninety-nine thousand, one hundred ninety-six".