81130168 has 32 divisors (see below), whose sum is σ = 179848800. Its totient is φ = 33570432.

The previous prime is 81130163. The next prime is 81130187. The reversal of 81130168 is 86103118.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81130163) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23355 + ... + 26602.

It is an arithmetic number, because the mean of its divisors is an integer number (5620275).

Almost surely, 2^81130168 is an apocalyptic number.

It is an amenable number.

81130168 is an abundant number, since it is smaller than the sum of its proper divisors (98718632).

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

81130168 is a wasteful number, since it uses less digits than its factorization.

81130168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49999 (or 49995 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 81130168 is about 9007.2286525879. The cubic root of 81130168 is about 432.9065183363.

The spelling of 81130168 in words is "eighty-one million, one hundred thirty thousand, one hundred sixty-eight".