81803228 has 12 divisors (see below), whose sum is σ = 154167720. Its totient is φ = 37755312.

The previous prime is 81803219. The next prime is 81803231. The reversal of 81803228 is 82230818.

It is a super-2 number, since 2×81803228² = 13383536222439968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81803194 and 81803203.

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, 786518 + ... + 786621.

It is an arithmetic number, because the mean of its divisors is an integer number (12847310).

Almost surely, 2^81803228 is an apocalyptic number.

It is an amenable number.

81803228 is a deficient number, since it is larger than the sum of its proper divisors (72364492).

81803228 is a wasteful number, since it uses less digits than its factorization.

81803228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573156 (or 1573154 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 81803228 is about 9044.5136961586. The cubic root of 81803228 is about 434.1003611685.

The spelling of 81803228 in words is "eighty-one million, eight hundred three thousand, two hundred twenty-eight".