28133923 has 2 divisors, whose sum is σ = 28133924. Its totient is φ = 28133922.

The previous prime is 28133921. The next prime is 28133939. The reversal of 28133923 is 32933182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28133923 - 2¹ = 28133921 is a prime.

Together with 28133921, it forms a pair of twin primes.

It is equal to p_1749235 and since 28133923 and 1749235 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (28133921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14066961 + 14066962.

It is an arithmetic number, because the mean of its divisors is an integer number (14066962).

Almost surely, 2^28133923 is an apocalyptic number.

28133923 is a deficient number, since it is larger than the sum of its proper divisors (1).

28133923 is an equidigital number, since it uses as much as digits as its factorization.

28133923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

The square root of 28133923 is about 5304.1420606918. The cubic root of 28133923 is about 304.1422572601.

The spelling of 28133923 in words is "twenty-eight million, one hundred thirty-three thousand, nine hundred twenty-three".