27728469 has 6 divisors (see below), whose sum is σ = 40052246. Its totient is φ = 18485640.

The previous prime is 27728431. The next prime is 27728473. The reversal of 27728469 is 96482772.

It can be written as a sum of positive squares in only one way, i.e., 18818244 + 8910225 = 4338^2 + 2985^2 .

It is not a de Polignac number, because 27728469 - 2¹¹ = 27726421 is a prime.

It is a super-2 number, since 2×27728469² = 1537735986167922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27728069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1540462 + ... + 1540479.

Almost surely, 2^27728469 is an apocalyptic number.

It is an amenable number.

27728469 is a deficient number, since it is larger than the sum of its proper divisors (12323777).

27728469 is a wasteful number, since it uses less digits than its factorization.

27728469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080947 (or 3080944 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 27728469 is about 5265.7828477825. The cubic root of 27728469 is about 302.6741260094.

The spelling of 27728469 in words is "twenty-seven million, seven hundred twenty-eight thousand, four hundred sixty-nine".