2180217808 has 20 divisors (see below), whose sum is σ = 4224989380. Its totient is φ = 1089897984.

The previous prime is 2180217799. The next prime is 2180217821. The reversal of 2180217808 is 8087120812.

It can be written as a sum of positive squares in 2 ways, for example, as 1469035584 + 711182224 = 38328^2 + 26668^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103258 + ... + 122566.

It is an arithmetic number, because the mean of its divisors is an integer number (211249469).

Almost surely, 2^2180217808 is an apocalyptic number.

It is an amenable number.

2180217808 is a deficient number, since it is larger than the sum of its proper divisors (2044771572).

2180217808 is a wasteful number, since it uses less digits than its factorization.

2180217808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26374 (or 26368 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 37.

The square root of 2180217808 is about 46692.8025288695. The cubic root of 2180217808 is about 1296.6814387449.

The spelling of 2180217808 in words is "two billion, one hundred eighty million, two hundred seventeen thousand, eight hundred eight".