680261808 has 80 divisors (see below), whose sum is σ = 1785885696. Its totient is φ = 223104000.

The previous prime is 680261801. The next prime is 680261831. The reversal of 680261808 is 808162086.

It is a super-2 number, since 2×680261808² = 925512254846857728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (680261801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 905433 + ... + 906183.

Almost surely, 2^680261808 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 680261808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (892942848).

680261808 is an abundant number, since it is smaller than the sum of its proper divisors (1105623888).

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

680261808 is a wasteful number, since it uses less digits than its factorization.

680261808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042 (or 1036 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 39.

The square root of 680261808 is about 26081.8290769647. The cubic root of 680261808 is about 879.4787753613.

The spelling of 680261808 in words is "six hundred eighty million, two hundred sixty-one thousand, eight hundred eight".