81814168 has 16 divisors (see below), whose sum is σ = 153947880. Its totient is φ = 40761408.

The previous prime is 81814163. The next prime is 81814199. The reversal of 81814168 is 86141818.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81814163) 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, 15805 + ... + 20332.

Almost surely, 2^81814168 is an apocalyptic number.

It is an amenable number.

81814168 is a deficient number, since it is larger than the sum of its proper divisors (72133712).

81814168 is a wasteful number, since it uses less digits than its factorization.

81814168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36426 (or 36422 counting only the distinct ones).

The product of its digits is 12288, while the sum is 37.

The square root of 81814168 is about 9045.1184624636. The cubic root of 81814168 is about 434.1197118567.

The spelling of 81814168 in words is "eighty-one million, eight hundred fourteen thousand, one hundred sixty-eight".