6725681 has 6 divisors (see below), whose sum is σ = 6895446. Its totient is φ = 6560000.

The previous prime is 6725657. The next prime is 6725687. The reversal of 6725681 is 1865276.

It can be written as a sum of positive squares in 3 ways, for example, as 1343281 + 5382400 = 1159^2 + 2320^2 .

It is not a de Polignac number, because 6725681 - 2¹⁸ = 6463537 is a prime.

It is a super-2 number, since 2×6725681² = 90469569827522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6725687) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 320 + ... + 3681.

It is an arithmetic number, because the mean of its divisors is an integer number (1149241).

Almost surely, 2^6725681 is an apocalyptic number.

It is an amenable number.

6725681 is a deficient number, since it is larger than the sum of its proper divisors (169765).

6725681 is an equidigital number, since it uses as much as digits as its factorization.

6725681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4083 (or 4042 counting only the distinct ones).

The product of its digits is 20160, while the sum is 35.

The square root of 6725681 is about 2593.3917945424. The cubic root of 6725681 is about 188.7609212575.

The spelling of 6725681 in words is "six million, seven hundred twenty-five thousand, six hundred eighty-one".