81682227 has 12 divisors (see below), whose sum is σ = 128711544. Its totient is φ = 49504320.

The previous prime is 81682217. The next prime is 81682231. The reversal of 81682227 is 72228618.

It is a happy number.

It is not a de Polignac number, because 81682227 - 2¹⁸ = 81420083 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81682191 and 81682200.

It is not an unprimeable number, because it can be changed into a prime (81682217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 412438 + ... + 412635.

It is an arithmetic number, because the mean of its divisors is an integer number (10725962).

Almost surely, 2^81682227 is an apocalyptic number.

81682227 is a deficient number, since it is larger than the sum of its proper divisors (47029317).

81682227 is a wasteful number, since it uses less digits than its factorization.

81682227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 825090 (or 825087 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 81682227 is about 9037.8220274577. The cubic root of 81682227 is about 433.8862192616.

The spelling of 81682227 in words is "eighty-one million, six hundred eighty-two thousand, two hundred twenty-seven".