1686800090 has 32 divisors (see below), whose sum is σ = 3074922000. Its totient is φ = 666147328.

The previous prime is 1686800077. The next prime is 1686800111. The reversal of 1686800090 is 900086861.

It can be written as a sum of positive squares in 8 ways, for example, as 4405801 + 1682394289 = 2099^2 + 41017^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 986156 + ... + 987864.

Almost surely, 2^1686800090 is an apocalyptic number.

1686800090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1686800090 is a deficient number, since it is larger than the sum of its proper divisors (1388121910).

1686800090 is a wasteful number, since it uses less digits than its factorization.

1686800090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2914.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1686800090 is about 41070.6718961353. The cubic root of 1686800090 is about 1190.3861680116.

The spelling of 1686800090 in words is "one billion, six hundred eighty-six million, eight hundred thousand, ninety".