81167968 has 24 divisors (see below), whose sum is σ = 182628432. Its totient is φ = 34786176.

The previous prime is 81167959. The next prime is 81167971. The reversal of 81167968 is 86976118.

It is a congruent number.

It is an unprimeable number.

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, 180955 + ... + 181402.

It is an arithmetic number, because the mean of its divisors is an integer number (7609518).

Almost surely, 2^81167968 is an apocalyptic number.

It is an amenable number.

81167968 is an abundant number, since it is smaller than the sum of its proper divisors (101460464).

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

81167968 is a wasteful number, since it uses less digits than its factorization.

81167968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 362374 (or 362366 counting only the distinct ones).

The product of its digits is 145152, while the sum is 46.

The square root of 81167968 is about 9009.3267229022. The cubic root of 81167968 is about 432.9737408671.

The spelling of 81167968 in words is "eighty-one million, one hundred sixty-seven thousand, nine hundred sixty-eight".