28307933 has 2 divisors, whose sum is σ = 28307934. Its totient is φ = 28307932.

The previous prime is 28307927. The next prime is 28307947. The reversal of 28307933 is 33970382.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21141604 + 7166329 = 4598^2 + 2677^2 .

It is a cyclic number.

It is not a de Polignac number, because 28307933 - 2¹⁶ = 28242397 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28307893 and 28307902.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28307953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14153966 + 14153967.

It is an arithmetic number, because the mean of its divisors is an integer number (14153967).

Almost surely, 2^28307933 is an apocalyptic number.

It is an amenable number.

28307933 is a deficient number, since it is larger than the sum of its proper divisors (1).

28307933 is an equidigital number, since it uses as much as digits as its factorization.

28307933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 28307933 is about 5320.5199933841. The cubic root of 28307933 is about 304.7680149417.

The spelling of 28307933 in words is "twenty-eight million, three hundred seven thousand, nine hundred thirty-three".