309056220 has 72 divisors (see below), whose sum is σ = 1022701680. Its totient is φ = 74922240.

The previous prime is 309056207. The next prime is 309056239. The reversal of 309056220 is 22650903.

309056220 is a `hidden beast` number, since 30 + 9 + 0 + 5 + 622 + 0 = 666.

309056220 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76065 + ... + 80024.

It is an arithmetic number, because the mean of its divisors is an integer number (14204190).

Almost surely, 2^309056220 is an apocalyptic number.

309056220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

309056220 is an abundant number, since it is smaller than the sum of its proper divisors (713645460).

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

309056220 is a wasteful number, since it uses less digits than its factorization.

309056220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156115 (or 156110 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 309056220 is about 17579.9948805453. The cubic root of 309056220 is about 676.1024289545.

The spelling of 309056220 in words is "three hundred nine million, fifty-six thousand, two hundred twenty".