1680768940 has 24 divisors (see below), whose sum is σ = 3535907760. Its totient is φ = 671108928.

The previous prime is 1680768853. The next prime is 1680768961. The reversal of 1680768940 is 498670861.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63375 + ... + 85894.

It is an arithmetic number, because the mean of its divisors is an integer number (147329490).

Almost surely, 2^1680768940 is an apocalyptic number.

1680768940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1680768940 is an abundant number, since it is smaller than the sum of its proper divisors (1855138820).

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

1680768940 is a wasteful number, since it uses less digits than its factorization.

1680768940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149841 (or 149839 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 49.

The square root of 1680768940 is about 40997.1820982857. The cubic root of 1680768940 is about 1188.9657327039.

The spelling of 1680768940 in words is "one billion, six hundred eighty million, seven hundred sixty-eight thousand, nine hundred forty".