181028205 has 12 divisors (see below), whose sum is σ = 313782300. Its totient is φ = 96548352.

The previous prime is 181028201. The next prime is 181028227. The reversal of 181028205 is 502820181.

181028205 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 71470116 + 109558089 = 8454^2 + 10467^2 .

It is not a de Polignac number, because 181028205 - 2² = 181028201 is a prime.

It is a super-2 number, since 2×181028205² = 65542422011044050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (181028201) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2011380 + ... + 2011469.

It is an arithmetic number, because the mean of its divisors is an integer number (26148525).

Almost surely, 2^181028205 is an apocalyptic number.

181028205 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

181028205 is a deficient number, since it is larger than the sum of its proper divisors (132754095).

181028205 is a wasteful number, since it uses less digits than its factorization.

181028205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4022860 (or 4022857 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 27.

The square root of 181028205 is about 13454.6722368105. The cubic root of 181028205 is about 565.6946633569.

Adding to 181028205 its reverse (502820181), we get a palindrome (683848386).

The spelling of 181028205 in words is "one hundred eighty-one million, twenty-eight thousand, two hundred five".