681704671 has 8 divisors (see below), whose sum is σ = 699233744. Its totient is φ = 664251840.

The previous prime is 681704669. The next prime is 681704693. The reversal of 681704671 is 176407186.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 681704671 - 2¹ = 681704669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681704071) 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, 726 + ... + 36931.

It is an arithmetic number, because the mean of its divisors is an integer number (87404218).

Almost surely, 2^681704671 is an apocalyptic number.

681704671 is a deficient number, since it is larger than the sum of its proper divisors (17529073).

681704671 is a wasteful number, since it uses less digits than its factorization.

681704671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38121.

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 681704671 is about 26109.4747361949. The cubic root of 681704671 is about 880.1001396889.

The spelling of 681704671 in words is "six hundred eighty-one million, seven hundred four thousand, six hundred seventy-one".