28123326 has 96 divisors (see below), whose sum is σ = 77096448. Its totient is φ = 7197120.

The previous prime is 28123283. The next prime is 28123339. The reversal of 28123326 is 62332182.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28123326.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 142660 + ... + 142856.

It is an arithmetic number, because the mean of its divisors is an integer number (803088).

Almost surely, 2^28123326 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28123326, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38548224).

28123326 is an abundant number, since it is smaller than the sum of its proper divisors (48973122).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28123326 is a wasteful number, since it uses less digits than its factorization.

28123326 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326 (or 323 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 28123326 is about 5303.1430303170. The cubic root of 28123326 is about 304.1040661146.

Subtracting 28123326 from its reverse (62332182), we obtain a triangular number (34208856 = T₈₂₇₁).

The spelling of 28123326 in words is "twenty-eight million, one hundred twenty-three thousand, three hundred twenty-six".