81112684 has 18 divisors (see below), whose sum is σ = 144696020. Its totient is φ = 39785616.

The previous prime is 81112673. The next prime is 81112687. The reversal of 81112684 is 48621118.

It is not an unprimeable number, because it can be changed into a prime (81112687) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7627 + ... + 14845.

Almost surely, 2^81112684 is an apocalyptic number.

It is an amenable number.

81112684 is a deficient number, since it is larger than the sum of its proper divisors (63583336).

81112684 is a wasteful number, since it uses less digits than its factorization.

81112684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7329 (or 7274 counting only the distinct ones).

The product of its digits is 3072, while the sum is 31.

The square root of 81112684 is about 9006.2580464919. The cubic root of 81112684 is about 432.8754181857.

It can be divided in two parts, 81112 and 684, that added together give a square (81796 = 286²).

The spelling of 81112684 in words is "eighty-one million, one hundred twelve thousand, six hundred eighty-four".