28549369 has 4 divisors (see below), whose sum is σ = 29533860. Its totient is φ = 27564880.

The previous prime is 28549363. The next prime is 28549373. The reversal of 28549369 is 96394582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 96394582 = 2 ⋅48197291.

It can be written as a sum of positive squares in 2 ways, for example, as 7728400 + 20820969 = 2780^2 + 4563^2 .

It is a cyclic number.

It is not a de Polignac number, because 28549369 - 2³ = 28549361 is a prime.

It is a super-2 number, since 2×28549369² = 1630132940596322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28549361) 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, 492202 + ... + 492259.

It is an arithmetic number, because the mean of its divisors is an integer number (7383465).

Almost surely, 2^28549369 is an apocalyptic number.

28549369 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28549369 is a deficient number, since it is larger than the sum of its proper divisors (984491).

28549369 is an equidigital number, since it uses as much as digits as its factorization.

28549369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 984490.

The product of its digits is 466560, while the sum is 46.

The square root of 28549369 is about 5343.1609558388. The cubic root of 28549369 is about 305.6320102579.

The spelling of 28549369 in words is "twenty-eight million, five hundred forty-nine thousand, three hundred sixty-nine".