681291860 has 24 divisors (see below), whose sum is σ = 1450866816. Its totient is φ = 268677920.

The previous prime is 681291857. The next prime is 681291869. The reversal of 681291860 is 68192186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681291869) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 238472 + ... + 241311.

It is an arithmetic number, because the mean of its divisors is an integer number (60452784).

Almost surely, 2^681291860 is an apocalyptic number.

It is an amenable number.

681291860 is an abundant number, since it is smaller than the sum of its proper divisors (769574956).

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

681291860 is a wasteful number, since it uses less digits than its factorization.

681291860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 479863 (or 479861 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 681291860 is about 26101.5681521245. The cubic root of 681291860 is about 879.9224535662.

The spelling of 681291860 in words is "six hundred eighty-one million, two hundred ninety-one thousand, eight hundred sixty".