1680897688 has 8 divisors (see below), whose sum is σ = 3151683180. Its totient is φ = 840448840.

The previous prime is 1680897683. The next prime is 1680897697. The reversal of 1680897688 is 8867980861.

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

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 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, 105056098 + ... + 105056113.

Almost surely, 2^1680897688 is an apocalyptic number.

It is an amenable number.

1680897688 is a deficient number, since it is larger than the sum of its proper divisors (1470785492).

1680897688 is a wasteful number, since it uses less digits than its factorization.

1680897688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 210112217 (or 210112213 counting only the distinct ones).

The product of its (nonzero) digits is 9289728, while the sum is 61.

The square root of 1680897688 is about 40998.7522736973. The cubic root of 1680897688 is about 1188.9960904463.

The spelling of 1680897688 in words is "one billion, six hundred eighty million, eight hundred ninety-seven thousand, six hundred eighty-eight".