680555520 has 264 divisors, whose sum is σ = 2449915104. Its totient is φ = 181149696.

The previous prime is 680555507. The next prime is 680555569. The reversal of 680555520 is 25555086.

680555520 is a `hidden beast` number, since 6 + 80 + 5 + 55 + 520 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1243887 + ... + 1244433.

Almost surely, 2^680555520 is an apocalyptic number.

680555520 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 680555520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1224957552).

680555520 is an abundant number, since it is smaller than the sum of its proper divisors (1769359584).

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

680555520 is an equidigital number, since it uses as much as digits as its factorization.

680555520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587 (or 557 counting only the distinct ones).

The product of its (nonzero) digits is 60000, while the sum is 36.

The square root of 680555520 is about 26087.4590560292. The cubic root of 680555520 is about 879.6053326657.

The spelling of 680555520 in words is "six hundred eighty million, five hundred fifty-five thousand, five hundred twenty".