673707681 has 12 divisors (see below), whose sum is σ = 1024351120. Its totient is φ = 425499480.

The previous prime is 673707679. The next prime is 673707689. The reversal of 673707681 is 186707376.

It is a happy number.

673707681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 673707681 - 2¹ = 673707679 is a prime.

It is a super-2 number, since 2×673707681² = 907764078876795522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673707689) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1969735 + ... + 1970076.

Almost surely, 2^673707681 is an apocalyptic number.

It is an amenable number.

673707681 is a deficient number, since it is larger than the sum of its proper divisors (350643439).

673707681 is a wasteful number, since it uses less digits than its factorization.

673707681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3939836 (or 3939833 counting only the distinct ones).

The product of its (nonzero) digits is 296352, while the sum is 45.

The square root of 673707681 is about 25955.8795073486. The cubic root of 673707681 is about 876.6451469768.

The spelling of 673707681 in words is "six hundred seventy-three million, seven hundred seven thousand, six hundred eighty-one".