680869940 has 48 divisors (see below), whose sum is σ = 1507840320. Its totient is φ = 257541120.

The previous prime is 680869939. The next prime is 680869961. The reversal of 680869940 is 49968086.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 261284 + ... + 263876.

It is an arithmetic number, because the mean of its divisors is an integer number (31413340).

Almost surely, 2^680869940 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 680869940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (753920160).

680869940 is an abundant number, since it is smaller than the sum of its proper divisors (826970380).

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

680869940 is a wasteful number, since it uses less digits than its factorization.

680869940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3312 (or 3310 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 680869940 is about 26093.4846273931. The cubic root of 680869940 is about 879.7407724743.

The spelling of 680869940 in words is "six hundred eighty million, eight hundred sixty-nine thousand, nine hundred forty".