1680808540 has 12 divisors (see below), whose sum is σ = 3529697976. Its totient is φ = 672323408.

The previous prime is 1680808523. The next prime is 1680808573. The reversal of 1680808540 is 458080861.

It is a junction number, because it is equal to n+sod(n) for n = 1680808493 and 1680808502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42020194 + ... + 42020233.

It is an arithmetic number, because the mean of its divisors is an integer number (294141498).

Almost surely, 2^1680808540 is an apocalyptic number.

1680808540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1680808540 is an abundant number, since it is smaller than the sum of its proper divisors (1848889436).

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

1680808540 is a wasteful number, since it uses less digits than its factorization.

1680808540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84040436 (or 84040434 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 1680808540 is about 40997.6650554638. The cubic root of 1680808540 is about 1188.9750702303.

The spelling of 1680808540 in words is "one billion, six hundred eighty million, eight hundred eight thousand, five hundred forty".