28840023 has 8 divisors (see below), whose sum is σ = 42726000. Its totient is φ = 19226664.

The previous prime is 28840001. The next prime is 28840027. The reversal of 28840023 is 32004882.

It is not a de Polignac number, because 28840023 - 2⁵ = 28839991 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1068149 = 28840023 / (2 + 8 + 8 + 4 + 0 + 0 + 2 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28840027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 534048 + ... + 534101.

It is an arithmetic number, because the mean of its divisors is an integer number (5340750).

Almost surely, 2^28840023 is an apocalyptic number.

28840023 is a deficient number, since it is larger than the sum of its proper divisors (13885977).

28840023 is a wasteful number, since it uses less digits than its factorization.

28840023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1068158 (or 1068152 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 28840023 is about 5370.2907742505. The cubic root of 28840023 is about 306.6656979858.

The spelling of 28840023 in words is "twenty-eight million, eight hundred forty thousand, twenty-three".