28155583 has 4 divisors (see below), whose sum is σ = 28810408. Its totient is φ = 27500760.

The previous prime is 28155581. The next prime is 28155593. The reversal of 28155583 is 38555182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 38555182 = 2 ⋅19277591.

It is a cyclic number.

It is not a de Polignac number, because 28155583 - 2¹ = 28155581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28155581) 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, 327348 + ... + 327433.

It is an arithmetic number, because the mean of its divisors is an integer number (7202602).

Almost surely, 2^28155583 is an apocalyptic number.

28155583 is a deficient number, since it is larger than the sum of its proper divisors (654825).

28155583 is an equidigital number, since it uses as much as digits as its factorization.

28155583 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 654824.

The product of its digits is 48000, while the sum is 37.

The square root of 28155583 is about 5306.1834683697. The cubic root of 28155583 is about 304.2202891721.

The spelling of 28155583 in words is "twenty-eight million, one hundred fifty-five thousand, five hundred eighty-three".