28349969 has 4 divisors (see below), whose sum is σ = 28362096. Its totient is φ = 28337844.

The previous prime is 28349929. The next prime is 28349987. The reversal of 28349969 is 96994382.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 96994382 = 2 ⋅48497191.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28349969 is a prime.

It is a super-2 number, since 2×28349969² = 1607441484601922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28349929) 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, 1319 + ... + 7644.

It is an arithmetic number, because the mean of its divisors is an integer number (7090524).

Almost surely, 2^28349969 is an apocalyptic number.

It is an amenable number.

28349969 is a deficient number, since it is larger than the sum of its proper divisors (12127).

28349969 is an equidigital number, since it uses as much as digits as its factorization.

28349969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12126.

The product of its digits is 839808, while the sum is 50.

The square root of 28349969 is about 5324.4688937020. The cubic root of 28349969 is about 304.9187959041.

The spelling of 28349969 in words is "twenty-eight million, three hundred forty-nine thousand, nine hundred sixty-nine".