28347133 has 2 divisors, whose sum is σ = 28347134. Its totient is φ = 28347132.

The previous prime is 28347131. The next prime is 28347139. The reversal of 28347133 is 33174382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27646564 + 700569 = 5258^2 + 837^2 .

It is a cyclic number.

It is not a de Polignac number, because 28347133 - 2¹ = 28347131 is a prime.

Together with 28347131, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 28347095 and 28347104.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28347131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14173566 + 14173567.

It is an arithmetic number, because the mean of its divisors is an integer number (14173567).

Almost surely, 2^28347133 is an apocalyptic number.

It is an amenable number.

28347133 is a deficient number, since it is larger than the sum of its proper divisors (1).

28347133 is an equidigital number, since it uses as much as digits as its factorization.

28347133 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 31.

The square root of 28347133 is about 5324.2025693995. The cubic root of 28347133 is about 304.9086280089.

The spelling of 28347133 in words is "twenty-eight million, three hundred forty-seven thousand, one hundred thirty-three".