28783269 has 20 divisors (see below), whose sum is σ = 43189740. Its totient is φ = 19103040.

The previous prime is 28783219. The next prime is 28783301. The reversal of 28783269 is 96238782.

It can be written as a sum of positive squares in 2 ways, for example, as 14152644 + 14630625 = 3762^2 + 3825^2 .

It is not a de Polignac number, because 28783269 - 2⁷ = 28783141 is a prime.

It is a super-2 number, since 2×28783269² = 1656953148652722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28783219) 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, 21129 + ... + 22449.

It is an arithmetic number, because the mean of its divisors is an integer number (2159487).

Almost surely, 2^28783269 is an apocalyptic number.

It is an amenable number.

28783269 is a deficient number, since it is larger than the sum of its proper divisors (14406471).

28783269 is a wasteful number, since it uses less digits than its factorization.

28783269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1602 (or 1593 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 28783269 is about 5365.0041006508. The cubic root of 28783269 is about 306.4644044080.

The spelling of 28783269 in words is "twenty-eight million, seven hundred eighty-three thousand, two hundred sixty-nine".