28133523 has 48 divisors (see below), whose sum is σ = 46725120. Its totient is φ = 16156800.

The previous prime is 28133507. The next prime is 28133527. The reversal of 28133523 is 32533182.

28133523 is a `hidden beast` number, since 2 + 8 + 133 + 523 = 666.

It is not a de Polignac number, because 28133523 - 2⁴ = 28133507 is a prime.

Its product of digits (4320) is a multiple of the sum of its prime factors (240).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28133527) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 273090 + ... + 273192.

It is an arithmetic number, because the mean of its divisors is an integer number (973440).

Almost surely, 2^28133523 is an apocalyptic number.

28133523 is a deficient number, since it is larger than the sum of its proper divisors (18591597).

28133523 is a wasteful number, since it uses less digits than its factorization.

28133523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240 (or 237 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 28133523 is about 5304.1043541771. The cubic root of 28133523 is about 304.1408158510.

It can be divided in two parts, 2813 and 3523, that multiplied together give a palindrome (9910199).

The spelling of 28133523 in words is "twenty-eight million, one hundred thirty-three thousand, five hundred twenty-three".