309908228 has 12 divisors (see below), whose sum is σ = 619816512. Its totient is φ = 132817800.

The previous prime is 309908227. The next prime is 309908237. The reversal of 309908228 is 822809903.

309908228 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (309908227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5534048 + ... + 5534103.

It is an arithmetic number, because the mean of its divisors is an integer number (51651376).

Almost surely, 2^309908228 is an apocalyptic number.

It is an amenable number.

309908228 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

309908228 is a wasteful number, since it uses less digits than its factorization.

309908228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11068162 (or 11068160 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 309908228 is about 17604.2105190775. The cubic root of 309908228 is about 676.7231532786.

The spelling of 309908228 in words is "three hundred nine million, nine hundred eight thousand, two hundred twenty-eight".