28238233 has 2 divisors, whose sum is σ = 28238234. Its totient is φ = 28238232.

The previous prime is 28238201. The next prime is 28238251. The reversal of 28238233 is 33283282.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28164249 + 73984 = 5307^2 + 272^2 .

It is a cyclic number.

It is not a de Polignac number, because 28238233 - 2⁵ = 28238201 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28238195 and 28238204.

It is not a weakly prime, because it can be changed into another prime (28238293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14119116 + 14119117.

It is an arithmetic number, because the mean of its divisors is an integer number (14119117).

Almost surely, 2^28238233 is an apocalyptic number.

It is an amenable number.

28238233 is a deficient number, since it is larger than the sum of its proper divisors (1).

28238233 is an equidigital number, since it uses as much as digits as its factorization.

28238233 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 31.

The square root of 28238233 is about 5313.9658448281. The cubic root of 28238233 is about 304.5176753536.

The spelling of 28238233 in words is "twenty-eight million, two hundred thirty-eight thousand, two hundred thirty-three".