81089228 has 24 divisors (see below), whose sum is σ = 158410560. Its totient is φ = 36000720.

The previous prime is 81089219. The next prime is 81089263. The reversal of 81089228 is 82298018.

It is a junction number, because it is equal to n+sod(n) for n = 81089191 and 81089200.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 19538 + ... + 23321.

It is an arithmetic number, because the mean of its divisors is an integer number (6600440).

Almost surely, 2^81089228 is an apocalyptic number.

It is an amenable number.

81089228 is a deficient number, since it is larger than the sum of its proper divisors (77321332).

81089228 is a wasteful number, since it uses less digits than its factorization.

81089228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42917 (or 42915 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 81089228 is about 9004.9557466986. The cubic root of 81089228 is about 432.8336881537.

The spelling of 81089228 in words is "eighty-one million, eighty-nine thousand, two hundred twenty-eight".