28857133 has 2 divisors, whose sum is σ = 28857134. Its totient is φ = 28857132.

The previous prime is 28857131. The next prime is 28857137. The reversal of 28857133 is 33175882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25220484 + 3636649 = 5022^2 + 1907^2 .

It is a cyclic number.

It is not a de Polignac number, because 28857133 - 2¹ = 28857131 is a prime.

Together with 28857131, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 28857092 and 28857101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28857131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14428566 + 14428567.

It is an arithmetic number, because the mean of its divisors is an integer number (14428567).

Almost surely, 2^28857133 is an apocalyptic number.

It is an amenable number.

28857133 is a deficient number, since it is larger than the sum of its proper divisors (1).

28857133 is an equidigital number, since it uses as much as digits as its factorization.

28857133 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40320, while the sum is 37.

The square root of 28857133 is about 5371.8835616569. The cubic root of 28857133 is about 306.7263314649.

The spelling of 28857133 in words is "twenty-eight million, eight hundred fifty-seven thousand, one hundred thirty-three".