28390269 has 8 divisors (see below), whose sum is σ = 38495520. Its totient is φ = 18605936.

The previous prime is 28390267. The next prime is 28390283. The reversal of 28390269 is 96209382.

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 28390269 - 2¹ = 28390267 is a prime.

It is a super-2 number, since 2×28390269² = 1612014747784722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28390267) 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, 80022 + ... + 80375.

It is an arithmetic number, because the mean of its divisors is an integer number (4811940).

Almost surely, 2^28390269 is an apocalyptic number.

It is an amenable number.

28390269 is a deficient number, since it is larger than the sum of its proper divisors (10105251).

28390269 is a wasteful number, since it uses less digits than its factorization.

28390269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160459.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 28390269 is about 5328.2519647629. The cubic root of 28390269 is about 305.0632100470.

The spelling of 28390269 in words is "twenty-eight million, three hundred ninety thousand, two hundred sixty-nine".