1680897687 has 16 divisors (see below), whose sum is σ = 2562312960. Its totient is φ = 960158592.

The previous prime is 1680897683. The next prime is 1680897697. The reversal of 1680897687 is 7867980861.

It is not a de Polignac number, because 1680897687 - 2² = 1680897683 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1680897687.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1680897683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50143 + ... + 76655.

It is an arithmetic number, because the mean of its divisors is an integer number (160144560).

Almost surely, 2^1680897687 is an apocalyptic number.

1680897687 is a deficient number, since it is larger than the sum of its proper divisors (881415273).

1680897687 is a wasteful number, since it uses less digits than its factorization.

1680897687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29542.

The product of its (nonzero) digits is 8128512, while the sum is 60.

The square root of 1680897687 is about 40998.7522615018. The cubic root of 1680897687 is about 1188.9960902105.

The spelling of 1680897687 in words is "one billion, six hundred eighty million, eight hundred ninety-seven thousand, six hundred eighty-seven".