306421056 has 336 divisors, whose sum is σ = 1031808960. Its totient is φ = 89579520.

The previous prime is 306420991. The next prime is 306421057. The reversal of 306421056 is 650124603.

306421056 is a `hidden beast` number, since 3 + 0 + 642 + 10 + 5 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (306421057) 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 47 ways as a sum of consecutive naturals, for example, 5023266 + ... + 5023326.

It is an arithmetic number, because the mean of its divisors is an integer number (3070860).

Almost surely, 2^306421056 is an apocalyptic number.

306421056 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 306421056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (515904480).

306421056 is an abundant number, since it is smaller than the sum of its proper divisors (725387904).

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

306421056 is a wasteful number, since it uses less digits than its factorization.

306421056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124 (or 102 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 306421056 is about 17504.8866320236. The cubic root of 306421056 is about 674.1753484842.

Adding to 306421056 its reverse (650124603), we get a palindrome (956545659).

The spelling of 306421056 in words is "three hundred six million, four hundred twenty-one thousand, fifty-six".