1686800872 has 8 divisors (see below), whose sum is σ = 3162751650. Its totient is φ = 843400432.

The previous prime is 1686800849. The next prime is 1686800873. The reversal of 1686800872 is 2780086861.

It can be written as a sum of positive squares in only one way, i.e., 1611701316 + 75099556 = 40146^2 + 8666^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (1686800873) by changing a digit.

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 as a sum of consecutive naturals, namely, 105425047 + ... + 105425062.

Almost surely, 2^1686800872 is an apocalyptic number.

It is an amenable number.

1686800872 is a deficient number, since it is larger than the sum of its proper divisors (1475950778).

1686800872 is a wasteful number, since it uses less digits than its factorization.

1686800872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210850115 (or 210850111 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 1686800872 is about 41070.6814163096. The cubic root of 1686800872 is about 1190.3863519658.

The spelling of 1686800872 in words is "one billion, six hundred eighty-six million, eight hundred thousand, eight hundred seventy-two".