680988 has 72 divisors (see below), whose sum is σ = 2025856. Its totient is φ = 174240.

The previous prime is 680987. The next prime is 680989. The reversal of 680988 is 889086.

It is an interprime number because it is at equal distance from previous prime (680987) and next prime (680989).

It is a super-2 number, since 2×680988² = 927489312288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680987) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10131 + ... + 10197.

2⁶⁸⁰⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 680988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1012928).

680988 is an abundant number, since it is smaller than the sum of its proper divisors (1344868).

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

680988 is a wasteful number, since it uses less digits than its factorization.

680988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103 (or 90 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 39.

The square root of 680988 is about 825.2199706745. The cubic root of 680988 is about 87.9791617326.

The spelling of 680988 in words is "six hundred eighty thousand, nine hundred eighty-eight".