28133507 has 2 divisors, whose sum is σ = 28133508. Its totient is φ = 28133506.

The previous prime is 28133491. The next prime is 28133527. The reversal of 28133507 is 70533182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28133507 - 2⁴ = 28133491 is a prime.

It is a super-3 number, since 3×28133507³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 28133507.

It is not a weakly prime, because it can be changed into another prime (28133527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14066753 + 14066754.

It is an arithmetic number, because the mean of its divisors is an integer number (14066754).

Almost surely, 2^28133507 is an apocalyptic number.

28133507 is a deficient number, since it is larger than the sum of its proper divisors (1).

28133507 is an equidigital number, since it uses as much as digits as its factorization.

28133507 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 28133507 is about 5304.1028459109. The cubic root of 28133507 is about 304.1407581944.

Adding to 28133507 its reverse (70533182), we get a palindrome (98666689).

The spelling of 28133507 in words is "twenty-eight million, one hundred thirty-three thousand, five hundred seven".