681880340 has 24 divisors (see below), whose sum is σ = 1478141952. Its totient is φ = 263953440.

The previous prime is 681880327. The next prime is 681880349. The reversal of 681880340 is 43088186.

It is a junction number, because it is equal to n+sod(n) for n = 681880294 and 681880303.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681880349) 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, 549284 + ... + 550523.

It is an arithmetic number, because the mean of its divisors is an integer number (61589248).

Almost surely, 2^681880340 is an apocalyptic number.

It is an amenable number.

681880340 is an abundant number, since it is smaller than the sum of its proper divisors (796261612).

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

681880340 is a wasteful number, since it uses less digits than its factorization.

681880340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1099847 (or 1099845 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 38.

The square root of 681880340 is about 26112.8386047936. The cubic root of 681880340 is about 880.1757310897.

The spelling of 681880340 in words is "six hundred eighty-one million, eight hundred eighty thousand, three hundred forty".