28938307 has 2 divisors, whose sum is σ = 28938308. Its totient is φ = 28938306.

The previous prime is 28938263. The next prime is 28938313. The reversal of 28938307 is 70383982.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28938307 - 2⁷ = 28938179 is a prime.

It is a super-2 number, since 2×28938307² = 1674851224052498, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28938307.

It is not a weakly prime, because it can be changed into another prime (28939307) 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, 14469153 + 14469154.

It is an arithmetic number, because the mean of its divisors is an integer number (14469154).

Almost surely, 2^28938307 is an apocalyptic number.

28938307 is a deficient number, since it is larger than the sum of its proper divisors (1).

28938307 is an equidigital number, since it uses as much as digits as its factorization.

28938307 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 28938307 is about 5379.4337062557. The cubic root of 28938307 is about 307.0136653192.

The spelling of 28938307 in words is "twenty-eight million, nine hundred thirty-eight thousand, three hundred seven".