81168396 has 24 divisors (see below), whose sum is σ = 189645120. Its totient is φ = 27020112.

The previous prime is 81168383. The next prime is 81168401. The reversal of 81168396 is 69386118.

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, 5835 + ... + 14013.

It is an arithmetic number, because the mean of its divisors is an integer number (7901880).

Almost surely, 2^81168396 is an apocalyptic number.

It is an amenable number.

81168396 is an abundant number, since it is smaller than the sum of its proper divisors (108476724).

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

81168396 is a wasteful number, since it uses less digits than its factorization.

81168396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9013 (or 9011 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 81168396 is about 9009.3504760332. The cubic root of 81168396 is about 432.9745018916.

The spelling of 81168396 in words is "eighty-one million, one hundred sixty-eight thousand, three hundred ninety-six".