81167908 has 12 divisors (see below), whose sum is σ = 142838640. Its totient is φ = 40356872.

The previous prime is 81167903. The next prime is 81167909. The reversal of 81167908 is 80976118.

It is not an unprimeable number, because it can be changed into a prime (81167903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55966 + ... + 57397.

It is an arithmetic number, because the mean of its divisors is an integer number (11903220).

Almost surely, 2^81167908 is an apocalyptic number.

It is an amenable number.

81167908 is a deficient number, since it is larger than the sum of its proper divisors (61670732).

81167908 is a wasteful number, since it uses less digits than its factorization.

81167908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113546 (or 113544 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 81167908 is about 9009.3233930190. The cubic root of 81167908 is about 432.9736341812.

The spelling of 81167908 in words is "eighty-one million, one hundred sixty-seven thousand, nine hundred eight".