6728181 has 4 divisors (see below), whose sum is σ = 8970912. Its totient is φ = 4485452.

The previous prime is 6728179. The next prime is 6728201. The reversal of 6728181 is 1818276.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6728181 - 2¹ = 6728179 is a prime.

It is a super-2 number, since 2×6728181² = 90536839137522, which contains 22 as substring.

It is a D-number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6728101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1121361 + ... + 1121366.

It is an arithmetic number, because the mean of its divisors is an integer number (2242728).

Almost surely, 2^6728181 is an apocalyptic number.

It is an amenable number.

6728181 is a deficient number, since it is larger than the sum of its proper divisors (2242731).

6728181 is a wasteful number, since it uses less digits than its factorization.

6728181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2242730.

The product of its digits is 5376, while the sum is 33.

The square root of 6728181 is about 2593.8737440361. The cubic root of 6728181 is about 188.7843064406.

The spelling of 6728181 in words is "six million, seven hundred twenty-eight thousand, one hundred eighty-one".