308221056 has 192 divisors, whose sum is σ = 1042554240. Its totient is φ = 86169600.

The previous prime is 308221051. The next prime is 308221061. The reversal of 308221056 is 650122803.

It is an interprime number because it is at equal distance from previous prime (308221051) and next prime (308221061).

It is a tau number, because it is divible by the number of its divisors (192).

It is not an unprimeable number, because it can be changed into a prime (308221051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 163801 + ... + 165671.

It is an arithmetic number, because the mean of its divisors is an integer number (5429970).

Almost surely, 2^308221056 is an apocalyptic number.

308221056 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 308221056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (521277120).

308221056 is an abundant number, since it is smaller than the sum of its proper divisors (734333184).

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

308221056 is a wasteful number, since it uses less digits than its factorization.

308221056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1915 (or 1900 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 308221056 is about 17556.2255624607. The cubic root of 308221056 is about 675.4928680161.

Adding to 308221056 its reverse (650122803), we get a palindrome (958343859).

It can be divided in two parts, 30822 and 1056, that added together give a triangular number (31878 = T₂₅₂).

The spelling of 308221056 in words is "three hundred eight million, two hundred twenty-one thousand, fifty-six".