181628266 has 8 divisors (see below), whose sum is σ = 273313764. Its totient is φ = 90523680.

The previous prime is 181628219. The next prime is 181628269. The reversal of 181628266 is 662826181.

181628266 is digitally balanced in base 3, 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 147112641 + 34515625 = 12129^2 + 5875^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (181628269) 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, 144445 + ... + 145696.

Almost surely, 2^181628266 is an apocalyptic number.

181628266 is a deficient number, since it is larger than the sum of its proper divisors (91685498).

181628266 is a wasteful number, since it uses less digits than its factorization.

181628266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290456.

The product of its digits is 55296, while the sum is 40.

The square root of 181628266 is about 13476.9531423093. The cubic root of 181628266 is about 566.3190171338.

The spelling of 181628266 in words is "one hundred eighty-one million, six hundred twenty-eight thousand, two hundred sixty-six".