308191228 has 12 divisors (see below), whose sum is σ = 544108320. Its totient is φ = 152731712.

The previous prime is 308191211. The next prime is 308191231. The reversal of 308191228 is 822191803.

It is a super-2 number, since 2×308191228² = 189963666032295968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 308191193 and 308191202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 340468 + ... + 341371.

It is an arithmetic number, because the mean of its divisors is an integer number (45342360).

Almost surely, 2^308191228 is an apocalyptic number.

It is an amenable number.

308191228 is a deficient number, since it is larger than the sum of its proper divisors (235917092).

308191228 is a wasteful number, since it uses less digits than its factorization.

308191228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681956 (or 681954 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The square root of 308191228 is about 17555.3760426828. The cubic root of 308191228 is about 675.4710771068.

The spelling of 308191228 in words is "three hundred eight million, one hundred ninety-one thousand, two hundred twenty-eight".