81868676 has 12 divisors (see below), whose sum is σ = 145973772. Its totient is φ = 40161888.

The previous prime is 81868673. The next prime is 81868691. The reversal of 81868676 is 67686818.

It can be written as a sum of positive squares in 2 ways, for example, as 66814276 + 15054400 = 8174^2 + 3880^2 .

It is not an unprimeable number, because it can be changed into a prime (81868673) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 192875 + ... + 193298.

It is an arithmetic number, because the mean of its divisors is an integer number (12164481).

Almost surely, 2^81868676 is an apocalyptic number.

It is an amenable number.

81868676 is a deficient number, since it is larger than the sum of its proper divisors (64105096).

81868676 is a wasteful number, since it uses less digits than its factorization.

81868676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386230 (or 386228 counting only the distinct ones).

The product of its digits is 774144, while the sum is 50.

The square root of 81868676 is about 9048.1310777420. The cubic root of 81868676 is about 434.2160999872.

The spelling of 81868676 in words is "eighty-one million, eight hundred sixty-eight thousand, six hundred seventy-six".