81093228 has 24 divisors (see below), whose sum is σ = 189898800. Its totient is φ = 26933760.

The previous prime is 81093223. The next prime is 81093319. The reversal of 81093228 is 82239018.

It is a super-2 number, since 2×81093228² = 13152223254919968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81093223) 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 7 ways as a sum of consecutive naturals, for example, 8653 + ... + 15396.

It is an arithmetic number, because the mean of its divisors is an integer number (7912450).

Almost surely, 2^81093228 is an apocalyptic number.

It is an amenable number.

81093228 is an abundant number, since it is smaller than the sum of its proper divisors (108805572).

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

81093228 is a wasteful number, since it uses less digits than its factorization.

81093228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24337 (or 24335 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 81093228 is about 9005.1778438852. The cubic root of 81093228 is about 432.8408050311.

The spelling of 81093228 in words is "eighty-one million, ninety-three thousand, two hundred twenty-eight".