1680194640 has 40 divisors (see below), whose sum is σ = 5208604128. Its totient is φ = 448051840.

The previous prime is 1680194639. The next prime is 1680194653. The reversal of 1680194640 is 464910861.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3500166 + ... + 3500645.

Almost surely, 2^1680194640 is an apocalyptic number.

1680194640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1680194640 is an abundant number, since it is smaller than the sum of its proper divisors (3528409488).

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

1680194640 is a wasteful number, since it uses less digits than its factorization.

1680194640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7000827 (or 7000821 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 1680194640 is about 40990.1773599481. The cubic root of 1680194640 is about 1188.8302985007.

The spelling of 1680194640 in words is "one billion, six hundred eighty million, one hundred ninety-four thousand, six hundred forty".