381220228 has 12 divisors (see below), whose sum is σ = 669269020. Its totient is φ = 190000512.

The previous prime is 381220211. The next prime is 381220247. The reversal of 381220228 is 822022183.

It can be written as a sum of positive squares in 2 ways, for example, as 11888704 + 369331524 = 3448^2 + 19218^2 .

It is a junction number, because it is equal to n+sod(n) for n = 381220196 and 381220205.

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, 150993 + ... + 153496.

Almost surely, 2^381220228 is an apocalyptic number.

It is an amenable number.

381220228 is a deficient number, since it is larger than the sum of its proper divisors (288048792).

381220228 is a wasteful number, since it uses less digits than its factorization.

381220228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304806 (or 304804 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 381220228 is about 19524.8617920845. The cubic root of 381220228 is about 725.0901056459.

The spelling of 381220228 in words is "three hundred eighty-one million, two hundred twenty thousand, two hundred twenty-eight".