681808067 has 8 divisors (see below), whose sum is σ = 735985440. Its totient is φ = 629675200.

The previous prime is 681808063. The next prime is 681808081. The reversal of 681808067 is 760808186.

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 681808067 - 2² = 681808063 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681808063) 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, 510434 + ... + 511767.

It is an arithmetic number, because the mean of its divisors is an integer number (91998180).

Almost surely, 2^681808067 is an apocalyptic number.

681808067 is a deficient number, since it is larger than the sum of its proper divisors (54177373).

681808067 is a wasteful number, since it uses less digits than its factorization.

681808067 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1022253.

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 681808067 is about 26111.4547086140. The cubic root of 681808067 is about 880.1446331661.

The spelling of 681808067 in words is "six hundred eighty-one million, eight hundred eight thousand, sixty-seven".