28133789 has 2 divisors, whose sum is σ = 28133790. Its totient is φ = 28133788.

The previous prime is 28133731. The next prime is 28133797. The reversal of 28133789 is 98733182.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19624900 + 8508889 = 4430^2 + 2917^2 .

It is a cyclic number.

It is not a de Polignac number, because 28133789 - 2¹⁶ = 28068253 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28139789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14066894 + 14066895.

It is an arithmetic number, because the mean of its divisors is an integer number (14066895).

Almost surely, 2^28133789 is an apocalyptic number.

It is an amenable number.

28133789 is a deficient number, since it is larger than the sum of its proper divisors (1).

28133789 is an equidigital number, since it uses as much as digits as its factorization.

28133789 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 41.

The square root of 28133789 is about 5304.1294290392. The cubic root of 28133789 is about 304.1417743896.

The spelling of 28133789 in words is "twenty-eight million, one hundred thirty-three thousand, seven hundred eighty-nine".