680955984 has 140 divisors (see below), whose sum is σ = 2005873600. Its totient is φ = 223808832.

The previous prime is 680955983. The next prime is 680956019. The reversal of 680955984 is 489559086.

It is a happy number.

680955984 is a `hidden beast` number, since 6 + 8 + 0 + 9 + 559 + 84 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 680955984.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680955983) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 921087 + ... + 921825.

Almost surely, 2^680955984 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 680955984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1002936800).

680955984 is an abundant number, since it is smaller than the sum of its proper divisors (1324917616).

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

680955984 is an equidigital number, since it uses as much as digits as its factorization.

680955984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 844 (or 823 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 54.

The square root of 680955984 is about 26095.1333393796. The cubic root of 680955984 is about 879.7778295891. Note that the first 3 decimals are identical.

The spelling of 680955984 in words is "six hundred eighty million, nine hundred fifty-five thousand, nine hundred eighty-four".