81168008 has 8 divisors (see below), whose sum is σ = 152190030. Its totient is φ = 40584000.

The previous prime is 81168007. The next prime is 81168083. The reversal of 81168008 is 80086118.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 63712324 + 17455684 = 7982^2 + 4178^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (81168001) 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 as a sum of consecutive naturals, namely, 5072993 + ... + 5073008.

Almost surely, 2^81168008 is an apocalyptic number.

It is an amenable number.

81168008 is a deficient number, since it is larger than the sum of its proper divisors (71022022).

81168008 is a wasteful number, since it uses less digits than its factorization.

81168008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10146007 (or 10146003 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 32.

The square root of 81168008 is about 9009.3289428237. The cubic root of 81168008 is about 432.9738119910.

The spelling of 81168008 in words is "eighty-one million, one hundred sixty-eight thousand, eight".