309866228 has 12 divisors (see below), whose sum is σ = 619732512. Its totient is φ = 132799800.

The previous prime is 309866197. The next prime is 309866237. The reversal of 309866228 is 822668903.

309866228 is an admirable number.

It is a congruent number.

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, 5533298 + ... + 5533353.

It is an arithmetic number, because the mean of its divisors is an integer number (51644376).

Almost surely, 2^309866228 is an apocalyptic number.

It is an amenable number.

309866228 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.

309866228 is a wasteful number, since it uses less digits than its factorization.

309866228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11066662 (or 11066660 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 309866228 is about 17603.0175822215. The cubic root of 309866228 is about 676.6925811565.

The spelling of 309866228 in words is "three hundred nine million, eight hundred sixty-six thousand, two hundred twenty-eight".