28223126326985 has 4 divisors (see below), whose sum is σ = 33867751592388. Its totient is φ = 22578501061584.

The previous prime is 28223126326973. The next prime is 28223126326987. The reversal of 28223126326985 is 58962362132282.

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 13137297460681 + 15085828866304 = 3624541^2 + 3884048^2 .

It is a cyclic number.

It is not a de Polignac number, because 28223126326985 - 2³⁰ = 28222052585161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28223126326987) 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, 2822312632694 + ... + 2822312632703.

It is an arithmetic number, because the mean of its divisors is an integer number (8466937898097).

Almost surely, 2^{28223126326985} is an apocalyptic number.

It is an amenable number.

28223126326985 is a deficient number, since it is larger than the sum of its proper divisors (5644625265403).

28223126326985 is an equidigital number, since it uses as much as digits as its factorization.

28223126326985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5644625265402.

The product of its digits is 29859840, while the sum is 59.

The spelling of 28223126326985 in words is "twenty-eight trillion, two hundred twenty-three billion, one hundred twenty-six million, three hundred twenty-six thousand, nine hundred eighty-five".