2728281 has 8 divisors (see below), whose sum is σ = 3706560. Its totient is φ = 1784432.

The previous prime is 2728277. The next prime is 2728289. The reversal of 2728281 is 1828272.

2728281 = T₂₉₄ + T₂₉₅ + ... + T₃₄₆.

It is a happy number.

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 2728281 - 2² = 2728277 is a prime.

It is a super-2 number, since 2×2728281² = 14887034429922, which contains 22 as substring.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (2728289) 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, 8421 + ... + 8738.

It is an arithmetic number, because the mean of its divisors is an integer number (463320).

2^2728281 is an apocalyptic number.

It is an amenable number.

2728281 is a deficient number, since it is larger than the sum of its proper divisors (978279).

2728281 is a wasteful number, since it uses less digits than its factorization.

2728281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17215.

The product of its digits is 3584, while the sum is 30.

The square root of 2728281 is about 1651.7508892082. The cubic root of 2728281 is about 139.7321579709.

Subtracting from 2728281 its reverse (1828272), we obtain a palindrome (900009).

The spelling of 2728281 in words is "two million, seven hundred twenty-eight thousand, two hundred eighty-one".