1681807568 has 40 divisors (see below), whose sum is σ = 3746343552. Its totient is φ = 716450688.

The previous prime is 1681807559. The next prime is 1681807571. The reversal of 1681807568 is 8657081861.

It is a congruent number.

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, 26255 + ... + 63662.

Almost surely, 2^1681807568 is an apocalyptic number.

It is an amenable number.

1681807568 is an abundant number, since it is smaller than the sum of its proper divisors (2064535984).

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

1681807568 is a wasteful number, since it uses less digits than its factorization.

1681807568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90099 (or 90093 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 50.

The square root of 1681807568 is about 41009.8472077134. The cubic root of 1681807568 is about 1189.2105886529.

The spelling of 1681807568 in words is "one billion, six hundred eighty-one million, eight hundred seven thousand, five hundred sixty-eight".