1680897706 has 8 divisors (see below), whose sum is σ = 2531158020. Its totient is φ = 837178368.

The previous prime is 1680897697. The next prime is 1680897709. The reversal of 1680897706 is 6077980861.

It can be written as a sum of positive squares in 2 ways, for example, as 1677639681 + 3258025 = 40959^2 + 1805^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1680897709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1634601 + ... + 1635628.

Almost surely, 2^1680897706 is an apocalyptic number.

1680897706 is a deficient number, since it is larger than the sum of its proper divisors (850260314).

1680897706 is a wasteful number, since it uses less digits than its factorization.

1680897706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3270488.

The product of its (nonzero) digits is 1016064, while the sum is 52.

The square root of 1680897706 is about 40998.7524932162. The cubic root of 1680897706 is about 1188.9960946904.

The spelling of 1680897706 in words is "one billion, six hundred eighty million, eight hundred ninety-seven thousand, seven hundred six".