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80305 = 516061
BaseRepresentation
bin10011100110110001
311002011021
4103212301
510032210
61415441
7453061
oct234661
9132137
1080305
1155375
123a581
132a724
14213a1
1518bda
hex139b1

80305 has 4 divisors (see below), whose sum is σ = 96372. Its totient is φ = 64240.

The previous prime is 80287. The next prime is 80309. The reversal of 80305 is 50308.

80305 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10609 + 69696 = 103^2 + 264^2 .

It is not a de Polignac number, because 80305 - 25 = 80273 is a prime.

It is a Duffinian number.

80305 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (80309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8026 + ... + 8035.

It is an arithmetic number, because the mean of its divisors is an integer number (24093).

280305 is an apocalyptic number.

It is an amenable number.

80305 is a deficient number, since it is larger than the sum of its proper divisors (16067).

80305 is a wasteful number, since it uses less digits than its factorization.

80305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16066.

The product of its (nonzero) digits is 120, while the sum is 16.

The square root of 80305 is about 283.3813684772. The cubic root of 80305 is about 43.1433829070.

The spelling of 80305 in words is "eighty thousand, three hundred five".

Divisors: 1 5 16061 80305