680320040 has 32 divisors (see below), whose sum is σ = 1535577480. Its totient is φ = 271264512.

The previous prime is 680320027. The next prime is 680320049. The reversal of 680320040 is 40023086.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 196056004 + 484264036 = 14002^2 + 22006^2 .

It is a junction number, because it is equal to n+sod(n) for n = 680319988 and 680320015.

It is not an unprimeable number, because it can be changed into a prime (680320049) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14147 + ... + 39506.

Almost surely, 2^680320040 is an apocalyptic number.

It is an amenable number.

680320040 is an abundant number, since it is smaller than the sum of its proper divisors (855257440).

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

680320040 is a wasteful number, since it uses less digits than its factorization.

680320040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53981 (or 53977 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 680320040 is about 26082.9453858263. The cubic root of 680320040 is about 879.5038697912.

The spelling of 680320040 in words is "six hundred eighty million, three hundred twenty thousand, forty".