81168075 has 72 divisors (see below), whose sum is σ = 155990016. Its totient is φ = 41796000.

The previous prime is 81168007. The next prime is 81168083. The reversal of 81168075 is 57086118.

It is not a de Polignac number, because 81168075 - 2²⁰ = 80119499 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 188110 + ... + 188540.

It is an arithmetic number, because the mean of its divisors is an integer number (2166528).

Almost surely, 2^81168075 is an apocalyptic number.

81168075 is a deficient number, since it is larger than the sum of its proper divisors (74821941).

81168075 is a wasteful number, since it uses less digits than its factorization.

81168075 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487 (or 470 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 36.

The square root of 81168075 is about 9009.3326611908. The cubic root of 81168075 is about 432.9739311235.

It can be divided in two parts, 811 and 68075, that added together give a palindrome (68886).

The spelling of 81168075 in words is "eighty-one million, one hundred sixty-eight thousand, seventy-five".