28577823 has 4 divisors (see below), whose sum is σ = 38103768. Its totient is φ = 19051880.

The previous prime is 28577797. The next prime is 28577827. The reversal of 28577823 is 32877582.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28577823 - 2¹⁴ = 28561439 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28577827) 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 3 ways as a sum of consecutive naturals, for example, 4762968 + ... + 4762973.

It is an arithmetic number, because the mean of its divisors is an integer number (9525942).

Almost surely, 2^28577823 is an apocalyptic number.

28577823 is a deficient number, since it is larger than the sum of its proper divisors (9525945).

28577823 is an equidigital number, since it uses as much as digits as its factorization.

28577823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9525944.

The product of its digits is 188160, while the sum is 42.

The square root of 28577823 is about 5345.8229488078. The cubic root of 28577823 is about 305.7335135601.

The spelling of 28577823 in words is "twenty-eight million, five hundred seventy-seven thousand, eight hundred twenty-three".