28333939 has 2 divisors, whose sum is σ = 28333940. Its totient is φ = 28333938.

The previous prime is 28333937. The next prime is 28333967. The reversal of 28333939 is 93933382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28333939 - 2¹ = 28333937 is a prime.

Together with 28333937, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (28333933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14166969 + 14166970.

It is an arithmetic number, because the mean of its divisors is an integer number (14166970).

Almost surely, 2^28333939 is an apocalyptic number.

28333939 is a deficient number, since it is larger than the sum of its proper divisors (1).

28333939 is an equidigital number, since it uses as much as digits as its factorization.

28333939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 40.

The square root of 28333939 is about 5322.9633663966. The cubic root of 28333939 is about 304.8613147144.

The spelling of 28333939 in words is "twenty-eight million, three hundred thirty-three thousand, nine hundred thirty-nine".