191663228 has 24 divisors (see below), whose sum is σ = 338688000. Its totient is φ = 94900208.

The previous prime is 191663207. The next prime is 191663231. The reversal of 191663228 is 822366191.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 191663191 and 191663200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319673 + ... + 320271.

It is an arithmetic number, because the mean of its divisors is an integer number (14112000).

Almost surely, 2^191663228 is an apocalyptic number.

It is an amenable number.

191663228 is a deficient number, since it is larger than the sum of its proper divisors (147024772).

191663228 is a wasteful number, since it uses less digits than its factorization.

191663228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249 (or 1247 counting only the distinct ones).

The product of its digits is 31104, while the sum is 38.

The square root of 191663228 is about 13844.2489142604. The cubic root of 191663228 is about 576.5623326155.

The spelling of 191663228 in words is "one hundred ninety-one million, six hundred sixty-three thousand, two hundred twenty-eight".