680648240 has 20 divisors (see below), whose sum is σ = 1582507344. Its totient is φ = 272259264.

The previous prime is 680648233. The next prime is 680648251. The reversal of 680648240 is 42846086.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 680648194 and 680648203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4253972 + ... + 4254131.

Almost surely, 2^680648240 is an apocalyptic number.

It is an amenable number.

680648240 is an abundant number, since it is smaller than the sum of its proper divisors (901859104).

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

680648240 is a wasteful number, since it uses less digits than its factorization.

680648240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8508116 (or 8508110 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 680648240 is about 26089.2360946042. The cubic root of 680648240 is about 879.6452771427.

The spelling of 680648240 in words is "six hundred eighty million, six hundred forty-eight thousand, two hundred forty".