1688718680 has 32 divisors (see below), whose sum is σ = 4145037840. Its totient is φ = 614079360.

The previous prime is 1688718679. The next prime is 1688718721. The reversal of 1688718680 is 868178861.

It is a happy number.

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, 1918559 + ... + 1919438.

Almost surely, 2^1688718680 is an apocalyptic number.

1688718680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1688718680 is an abundant number, since it is smaller than the sum of its proper divisors (2456319160).

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

1688718680 is a wasteful number, since it uses less digits than its factorization.

1688718680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3838019 (or 3838015 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 53.

The square root of 1688718680 is about 41094.0224363593. The cubic root of 1688718680 is about 1190.8373176289.

The spelling of 1688718680 in words is "one billion, six hundred eighty-eight million, seven hundred eighteen thousand, six hundred eighty".