1680728790 has 64 divisors (see below), whose sum is σ = 4572691200. Its totient is φ = 391941504.

The previous prime is 1680728759. The next prime is 1680728813. The reversal of 1680728790 is 978270861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 106000 + ... + 120819.

It is an arithmetic number, because the mean of its divisors is an integer number (71448300).

Almost surely, 2^1680728790 is an apocalyptic number.

1680728790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1680728790 is an abundant number, since it is smaller than the sum of its proper divisors (2891962410).

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

1680728790 is a wasteful number, since it uses less digits than its factorization.

1680728790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226861.

The product of its (nonzero) digits is 338688, while the sum is 48.

The square root of 1680728790 is about 40996.6924275605. The cubic root of 1680728790 is about 1188.9562653398.

The spelling of 1680728790 in words is "one billion, six hundred eighty million, seven hundred twenty-eight thousand, seven hundred ninety".