180636985 has 32 divisors (see below), whose sum is σ = 236755872. Its totient is φ = 131788800.

The previous prime is 180636977. The next prime is 180636991. The reversal of 180636985 is 589636081.

It can be written as a sum of positive squares in 16 ways, for example, as 5683456 + 174953529 = 2384^2 + 13227^2 .

It is not a de Polignac number, because 180636985 - 2³ = 180636977 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 454807 + ... + 455203.

It is an arithmetic number, because the mean of its divisors is an integer number (7398621).

Almost surely, 2^180636985 is an apocalyptic number.

It is an amenable number.

180636985 is a deficient number, since it is larger than the sum of its proper divisors (56118887).

180636985 is a wasteful number, since it uses less digits than its factorization.

180636985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 180636985 is about 13440.1259294696. The cubic root of 180636985 is about 565.2868619263.

The spelling of 180636985 in words is "one hundred eighty million, six hundred thirty-six thousand, nine hundred eighty-five".