28203269 has 4 divisors (see below), whose sum is σ = 28216140. Its totient is φ = 28190400.

The previous prime is 28203257. The next prime is 28203281. The reversal of 28203269 is 96230282.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28203257) and next prime (28203281).

It can be written as a sum of positive squares in 2 ways, for example, as 10647169 + 17556100 = 3263^2 + 4190^2 .

It is a cyclic number.

It is not a de Polignac number, because 28203269 - 2²⁰ = 27154693 is a prime.

It is a super-2 number, since 2×28203269² = 1590848764572722, 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 (28203209) 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, 2234 + ... + 7835.

It is an arithmetic number, because the mean of its divisors is an integer number (7054035).

Almost surely, 2^28203269 is an apocalyptic number.

It is an amenable number.

28203269 is a deficient number, since it is larger than the sum of its proper divisors (12871).

28203269 is a wasteful number, since it uses less digits than its factorization.

28203269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12870.

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 28203269 is about 5310.6750041779. The cubic root of 28203269 is about 304.3919409354.

The spelling of 28203269 in words is "twenty-eight million, two hundred three thousand, two hundred sixty-nine".