28544867 has 4 divisors (see below), whose sum is σ = 30740640. Its totient is φ = 26349096.

The previous prime is 28544843. The next prime is 28544891. The reversal of 28544867 is 76844582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 76844582 = 2 ⋅38422291.

It is an interprime number because it is at equal distance from previous prime (28544843) and next prime (28544891).

It is a cyclic number.

It is not a de Polignac number, because 28544867 - 2¹⁰ = 28543843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28544807) 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, 1097867 + ... + 1097892.

It is an arithmetic number, because the mean of its divisors is an integer number (7685160).

Almost surely, 2^28544867 is an apocalyptic number.

28544867 is a deficient number, since it is larger than the sum of its proper divisors (2195773).

28544867 is a wasteful number, since it uses less digits than its factorization.

28544867 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2195772.

The product of its digits is 430080, while the sum is 44.

The square root of 28544867 is about 5342.7396530245. The cubic root of 28544867 is about 305.6159441977.

The spelling of 28544867 in words is "twenty-eight million, five hundred forty-four thousand, eight hundred sixty-seven".