81886275 has 24 divisors (see below), whose sum is σ = 150429360. Its totient is φ = 43672320.

The previous prime is 81886271. The next prime is 81886289. The reversal of 81886275 is 57268818.

81886275 is a `hidden beast` number, since 8 + 18 + 8 + 627 + 5 = 666.

It is not a de Polignac number, because 81886275 - 2² = 81886271 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 81886275.

It is not an unprimeable number, because it can be changed into a prime (81886271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 59982 + ... + 61331.

It is an arithmetic number, because the mean of its divisors is an integer number (6267890).

Almost surely, 2^81886275 is an apocalyptic number.

81886275 is a deficient number, since it is larger than the sum of its proper divisors (68543085).

81886275 is a wasteful number, since it uses less digits than its factorization.

81886275 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121332 (or 121321 counting only the distinct ones).

The product of its digits is 215040, while the sum is 45.

The square root of 81886275 is about 9049.1035467609. The cubic root of 81886275 is about 434.2472116895.

The spelling of 81886275 in words is "eighty-one million, eight hundred eighty-six thousand, two hundred seventy-five".