180641690 has 16 divisors (see below), whose sum is σ = 326199528. Its totient is φ = 72024576.

The previous prime is 180641689. The next prime is 180641707. The reversal of 180641690 is 96146081.

It can be written as a sum of positive squares in 4 ways, for example, as 67453369 + 113188321 = 8213^2 + 10639^2 .

It is a super-2 number, since 2×180641690² = 65262840332112200, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 180641690.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25727 + ... + 31986.

Almost surely, 2^180641690 is an apocalyptic number.

180641690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

180641690 is a deficient number, since it is larger than the sum of its proper divisors (145557838).

180641690 is a wasteful number, since it uses less digits than its factorization.

180641690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58033.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 180641690 is about 13440.3009638921. The cubic root of 180641690 is about 565.2917698389.

The spelling of 180641690 in words is "one hundred eighty million, six hundred forty-one thousand, six hundred ninety".