22728133 has 4 divisors (see below), whose sum is σ = 24065100. Its totient is φ = 21391168.

The previous prime is 22728113. The next prime is 22728137. The reversal of 22728133 is 33182722.

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 17447329 + 5280804 = 4177^2 + 2298^2 .

It is a de Polignac number, because none of the positive numbers 2^k-22728133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22728137) 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, 668458 + ... + 668491.

It is an arithmetic number, because the mean of its divisors is an integer number (6016275).

Almost surely, 2^22728133 is an apocalyptic number.

It is an amenable number.

22728133 is a deficient number, since it is larger than the sum of its proper divisors (1336967).

22728133 is a wasteful number, since it uses less digits than its factorization.

22728133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1336966.

The product of its digits is 4032, while the sum is 28.

The square root of 22728133 is about 4767.4031715390. The cubic root of 22728133 is about 283.2617413890.

The spelling of 22728133 in words is "twenty-two million, seven hundred twenty-eight thousand, one hundred thirty-three".