81368396 has 12 divisors (see below), whose sum is σ = 142457952. Its totient is φ = 40666128.

The previous prime is 81368389. The next prime is 81368401. The reversal of 81368396 is 69386318.

It is a super-2 number, since 2×81368396² = 13241631735225632, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14621 + ... + 19403.

It is an arithmetic number, because the mean of its divisors is an integer number (11871496).

Almost surely, 2^81368396 is an apocalyptic number.

It is an amenable number.

81368396 is a deficient number, since it is larger than the sum of its proper divisors (61089556).

81368396 is a wasteful number, since it uses less digits than its factorization.

81368396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9040 (or 9038 counting only the distinct ones).

The product of its digits is 186624, while the sum is 44.

The square root of 81368396 is about 9020.4432263609. The cubic root of 81368396 is about 433.3298285055.

The spelling of 81368396 in words is "eighty-one million, three hundred sixty-eight thousand, three hundred ninety-six".