28390853 has 4 divisors (see below), whose sum is σ = 28445868. Its totient is φ = 28335840.

The previous prime is 28390849. The next prime is 28390891. The reversal of 28390853 is 35809382.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7579009 + 20811844 = 2753^2 + 4562^2 .

It is a cyclic number.

It is not a de Polignac number, because 28390853 - 2² = 28390849 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28390253) 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, 26726 + ... + 27767.

It is an arithmetic number, because the mean of its divisors is an integer number (7111467).

Almost surely, 2^28390853 is an apocalyptic number.

It is an amenable number.

28390853 is a deficient number, since it is larger than the sum of its proper divisors (55015).

28390853 is an equidigital number, since it uses as much as digits as its factorization.

28390853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55014.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 28390853 is about 5328.3067666943. The cubic root of 28390853 is about 305.0653017929.

The spelling of 28390853 in words is "twenty-eight million, three hundred ninety thousand, eight hundred fifty-three".