28270561 has 6 divisors (see below), whose sum is σ = 31074386. Its totient is φ = 25700400.

The previous prime is 28270559. The next prime is 28270573. The reversal of 28270561 is 16507282.

28270561 = T₁₉₉ + T₂₀₀ + ... + T₅₆₁.

It can be written as a sum of positive squares in only one way, i.e., 17380561 + 10890000 = 4169^2 + 3300^2 .

It is not a de Polignac number, because 28270561 - 2¹ = 28270559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28270591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116700 + ... + 116941.

Almost surely, 2^28270561 is an apocalyptic number.

It is an amenable number.

28270561 is a deficient number, since it is larger than the sum of its proper divisors (2803825).

28270561 is a wasteful number, since it uses less digits than its factorization.

28270561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233663 (or 233652 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 28270561 is about 5317.0067707311. The cubic root of 28270561 is about 304.6338381113.

The spelling of 28270561 in words is "twenty-eight million, two hundred seventy thousand, five hundred sixty-one".