6729561 has 20 divisors (see below), whose sum is σ = 10123344. Its totient is φ = 4455000.

The previous prime is 6729533. The next prime is 6729571. The reversal of 6729561 is 1659276.

It is not a de Polignac number, because 6729561 - 2⁶ = 6729497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6729521) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 20166 + ... + 20496.

Almost surely, 2^6729561 is an apocalyptic number.

It is an amenable number.

6729561 is a deficient number, since it is larger than the sum of its proper divisors (3393783).

6729561 is a wasteful number, since it uses less digits than its factorization.

6729561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594 (or 585 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 6729561 is about 2594.1397418027. The cubic root of 6729561 is about 188.7972125803.

The spelling of 6729561 in words is "six million, seven hundred twenty-nine thousand, five hundred sixty-one".