680398920 has 128 divisors (see below), whose sum is σ = 2329430400. Its totient is φ = 176525568.

The previous prime is 680398913. The next prime is 680398921. The reversal of 680398920 is 29893086.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (680398921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31447 + ... + 48473.

It is an arithmetic number, because the mean of its divisors is an integer number (18198675).

Almost surely, 2^680398920 is an apocalyptic number.

680398920 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 680398920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1164715200).

680398920 is an abundant number, since it is smaller than the sum of its proper divisors (1649031480).

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

680398920 is a wasteful number, since it uses less digits than its factorization.

680398920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17084 (or 17074 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 45.

The square root of 680398920 is about 26084.4574411660. The cubic root of 680398920 is about 879.5378599625.

The spelling of 680398920 in words is "six hundred eighty million, three hundred ninety-eight thousand, nine hundred twenty".