308805220 has 12 divisors (see below), whose sum is σ = 648491004. Its totient is φ = 123522080.

The previous prime is 308805179. The next prime is 308805247. The reversal of 308805220 is 22508803.

It can be written as a sum of positive squares in 2 ways, for example, as 59228416 + 249576804 = 7696^2 + 15798^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7720111 + ... + 7720150.

It is an arithmetic number, because the mean of its divisors is an integer number (54040917).

Almost surely, 2^308805220 is an apocalyptic number.

It is an amenable number.

308805220 is an abundant number, since it is smaller than the sum of its proper divisors (339685784).

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

308805220 is a wasteful number, since it uses less digits than its factorization.

308805220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15440270 (or 15440268 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 308805220 is about 17572.8546343501. The cubic root of 308805220 is about 675.9193471930.

It can be divided in two parts, 30880 and 5220, that added together give a square (36100 = 190²).

The spelling of 308805220 in words is "three hundred eight million, eight hundred five thousand, two hundred twenty".