181956228 has 24 divisors (see below), whose sum is σ = 429337440. Its totient is φ = 59970240.

The previous prime is 181956227. The next prime is 181956233. The reversal of 181956228 is 822659181.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 181956228.

It is not an unprimeable number, because it can be changed into a prime (181956227) 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, 84118 + ... + 86253.

It is an arithmetic number, because the mean of its divisors is an integer number (17889060).

Almost surely, 2^181956228 is an apocalyptic number.

It is an amenable number.

181956228 is an abundant number, since it is smaller than the sum of its proper divisors (247381212).

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

181956228 is a wasteful number, since it uses less digits than its factorization.

181956228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 170467 (or 170465 counting only the distinct ones).

The product of its digits is 69120, while the sum is 42.

The square root of 181956228 is about 13489.1151674230. The cubic root of 181956228 is about 566.6596752694.

The spelling of 181956228 in words is "one hundred eighty-one million, nine hundred fifty-six thousand, two hundred twenty-eight".