681291856 has 40 divisors (see below), whose sum is σ = 1522442240. Its totient is φ = 289298304.

The previous prime is 681291833. The next prime is 681291857. The reversal of 681291856 is 658192186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681291857) 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, 15696 + ... + 40111.

It is an arithmetic number, because the mean of its divisors is an integer number (38061056).

Almost surely, 2^681291856 is an apocalyptic number.

It is an amenable number.

681291856 is an abundant number, since it is smaller than the sum of its proper divisors (841150384).

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

681291856 is a wasteful number, since it uses less digits than its factorization.

681291856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55931 (or 55925 counting only the distinct ones).

The product of its digits is 207360, while the sum is 46.

The square root of 681291856 is about 26101.5680755008. The cubic root of 681291856 is about 879.9224518441.

The spelling of 681291856 in words is "six hundred eighty-one million, two hundred ninety-one thousand, eight hundred fifty-six".