81568168 has 32 divisors (see below), whose sum is σ = 167196960. Its totient is φ = 36998080.

The previous prime is 81568153. The next prime is 81568177. The reversal of 81568168 is 86186518.

It is a happy number.

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, 69555 + ... + 70717.

It is an arithmetic number, because the mean of its divisors is an integer number (5224905).

Almost surely, 2^81568168 is an apocalyptic number.

81568168 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81568168 is an abundant number, since it is smaller than the sum of its proper divisors (85628792).

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

81568168 is a wasteful number, since it uses less digits than its factorization.

81568168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1977 (or 1973 counting only the distinct ones).

The product of its digits is 92160, while the sum is 43.

The square root of 81568168 is about 9031.5097298292. The cubic root of 81568168 is about 433.6841692650.

The spelling of 81568168 in words is "eighty-one million, five hundred sixty-eight thousand, one hundred sixty-eight".