181809028 has 6 divisors (see below), whose sum is σ = 318165806. Its totient is φ = 90904512.

The previous prime is 181809013. The next prime is 181809071. The reversal of 181809028 is 820908181.

181809028 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 only one way, i.e., 180150084 + 1658944 = 13422^2 + 1288^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22726125 + ... + 22726132.

Almost surely, 2^181809028 is an apocalyptic number.

It is an amenable number.

181809028 is a deficient number, since it is larger than the sum of its proper divisors (136356778).

181809028 is a wasteful number, since it uses less digits than its factorization.

181809028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45452261 (or 45452259 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 37.

The square root of 181809028 is about 13483.6578123297. The cubic root of 181809028 is about 566.5068275060.

The spelling of 181809028 in words is "one hundred eighty-one million, eight hundred nine thousand, twenty-eight".