680605440 has 108 divisors (see below), whose sum is σ = 2178859032. Its totient is φ = 181063680.

The previous prime is 680605439. The next prime is 680605463. The reversal of 680605440 is 44506086.

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 11 ways as a sum of consecutive naturals, for example, 1616430 + ... + 1616850.

Almost surely, 2^680605440 is an apocalyptic number.

680605440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 680605440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1089429516).

680605440 is an abundant number, since it is smaller than the sum of its proper divisors (1498253592).

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

680605440 is an frugal number, since it uses more digits than its factorization.

680605440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 866 (or 431 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 680605440 is about 26088.4158200532. The cubic root of 680605440 is about 879.6268390299.

The spelling of 680605440 in words is "six hundred eighty million, six hundred five thousand, four hundred forty".