206180864 has 20 divisors (see below), whose sum is σ = 411960054. Its totient is φ = 103090176.

The previous prime is 206180851. The next prime is 206180873. The reversal of 206180864 is 468081602.

It can be written as a sum of positive squares in only one way, i.e., 130142464 + 76038400 = 11408^2 + 8720^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 200837 + ... + 201860.

Almost surely, 2^206180864 is an apocalyptic number.

It is an amenable number.

206180864 is a deficient number, since it is larger than the sum of its proper divisors (205779190).

206180864 is an frugal number, since it uses more digits than its factorization.

206180864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402715 (or 402699 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 206180864 is about 14358.9994080368. Note that the first 3 decimals coincide. The cubic root of 206180864 is about 590.7668511745.

The spelling of 206180864 in words is "two hundred six million, one hundred eighty thousand, eight hundred sixty-four".