305856 has 70 divisors (see below), whose sum is σ = 922020. Its totient is φ = 100224.

The previous prime is 305849. The next prime is 305857. The reversal of 305856 is 658503.

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

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (305857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5155 + ... + 5213.

2³⁰⁵⁸⁵⁶ is an apocalyptic number.

305856 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 305856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (461010).

305856 is an abundant number, since it is smaller than the sum of its proper divisors (616164).

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

305856 is an equidigital number, since it uses as much as digits as its factorization.

305856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 305856 is about 553.0424938465. The cubic root of 305856 is about 67.3760688960.

It can be divided in two parts, 30 and 5856, that added together give a triangular number (5886 = T₁₀₈).

The spelling of 305856 in words is "three hundred five thousand, eight hundred fifty-six".