28735133 has 4 divisors (see below), whose sum is σ = 32840160. Its totient is φ = 24630108.

The previous prime is 28735129. The next prime is 28735141. The reversal of 28735133 is 33153782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 33153782 = 2 ⋅16576891.

It is a cyclic number.

It is not a de Polignac number, because 28735133 - 2² = 28735129 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28735133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28735123) 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, 2052503 + ... + 2052516.

It is an arithmetic number, because the mean of its divisors is an integer number (8210040).

Almost surely, 2^28735133 is an apocalyptic number.

It is an amenable number.

28735133 is a deficient number, since it is larger than the sum of its proper divisors (4105027).

28735133 is an equidigital number, since it uses as much as digits as its factorization.

28735133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4105026.

The product of its digits is 15120, while the sum is 32.

The square root of 28735133 is about 5360.5161132115. The cubic root of 28735133 is about 306.2934694370.

The spelling of 28735133 in words is "twenty-eight million, seven hundred thirty-five thousand, one hundred thirty-three".