81799312 has 40 divisors (see below), whose sum is σ = 181881216. Its totient is φ = 34910976.

The previous prime is 81799307. The next prime is 81799327. The reversal of 81799312 is 21399718.

It is a super-2 number, since 2×81799312² = 13382254887346688, 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 7 ways as a sum of consecutive naturals, for example, 28068 + ... + 30844.

Almost surely, 2^81799312 is an apocalyptic number.

It is an amenable number.

81799312 is an abundant number, since it is smaller than the sum of its proper divisors (100081904).

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

81799312 is a wasteful number, since it uses less digits than its factorization.

81799312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3055 (or 3049 counting only the distinct ones).

The product of its digits is 27216, while the sum is 40.

The square root of 81799312 is about 9044.2972087388. The cubic root of 81799312 is about 434.0934341226.

The spelling of 81799312 in words is "eighty-one million, seven hundred ninety-nine thousand, three hundred twelve".