1680680 has 16 divisors (see below), whose sum is σ = 3781620. Its totient is φ = 672256.

The previous prime is 1680659. The next prime is 1680689. The reversal of 1680680 is 860861.

It can be written as a sum of positive squares in 2 ways, for example, as 1552516 + 128164 = 1246^2 + 358^2 .

It is not an unprimeable number, because it can be changed into a prime (1680689) 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, 20969 + ... + 21048.

2^1680680 is an apocalyptic number.

1680680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1680680 is an abundant number, since it is smaller than the sum of its proper divisors (2100940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1680680 is a wasteful number, since it uses less digits than its factorization.

1680680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42028 (or 42024 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 1680680 is about 1296.4104288380. The cubic root of 1680680 is about 118.8944760462.

The spelling of 1680680 in words is "one million, six hundred eighty thousand, six hundred eighty".