28663369 has 4 divisors (see below), whose sum is σ = 32758144. Its totient is φ = 24568596.

The previous prime is 28663367. The next prime is 28663409. The reversal of 28663369 is 96336682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28663369 - 2¹ = 28663367 is a prime.

It is a super-2 number, since 2×28663369² = 1643177444860322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28663361) 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, 2047377 + ... + 2047390.

It is an arithmetic number, because the mean of its divisors is an integer number (8189536).

Almost surely, 2^28663369 is an apocalyptic number.

It is an amenable number.

28663369 is a deficient number, since it is larger than the sum of its proper divisors (4094775).

28663369 is an equidigital number, since it uses as much as digits as its factorization.

28663369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4094774.

The product of its digits is 279936, while the sum is 43.

The square root of 28663369 is about 5353.8181702407. The cubic root of 28663369 is about 306.0382746491.

The spelling of 28663369 in words is "twenty-eight million, six hundred sixty-three thousand, three hundred sixty-nine".