81122228 has 12 divisors (see below), whose sum is σ = 154869792. Its totient is φ = 36873720.

The previous prime is 81122213. The next prime is 81122273. The reversal of 81122228 is 82222118.

It is a junction number, because it is equal to n+sod(n) for n = 81122197 and 81122206.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 921800 + ... + 921887.

It is an arithmetic number, because the mean of its divisors is an integer number (12905816).

Almost surely, 2^81122228 is an apocalyptic number.

It is an amenable number.

81122228 is a deficient number, since it is larger than the sum of its proper divisors (73747564).

81122228 is a wasteful number, since it uses less digits than its factorization.

81122228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843702 (or 1843700 counting only the distinct ones).

The product of its digits is 1024, while the sum is 26.

The square root of 81122228 is about 9006.7878847012. The cubic root of 81122228 is about 432.8923953947.

The spelling of 81122228 in words is "eighty-one million, one hundred twenty-two thousand, two hundred twenty-eight".