28549459 has 4 divisors (see below), whose sum is σ = 29321104. Its totient is φ = 27777816.

The previous prime is 28549447. The next prime is 28549471. The reversal of 28549459 is 95494582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95494582 = 2 ⋅47747291.

It is an interprime number because it is at equal distance from previous prime (28549447) and next prime (28549471).

It is a cyclic number.

It is not a de Polignac number, because 28549459 - 2¹⁷ = 28418387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28549259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385767 + ... + 385840.

It is an arithmetic number, because the mean of its divisors is an integer number (7330276).

Almost surely, 2^28549459 is an apocalyptic number.

28549459 is a deficient number, since it is larger than the sum of its proper divisors (771645).

28549459 is an equidigital number, since it uses as much as digits as its factorization.

28549459 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771644.

The product of its digits is 518400, while the sum is 46.

The square root of 28549459 is about 5343.1693778131. The cubic root of 28549459 is about 305.6323314192.

The spelling of 28549459 in words is "twenty-eight million, five hundred forty-nine thousand, four hundred fifty-nine".