28528939 has 2 divisors, whose sum is σ = 28528940. Its totient is φ = 28528938.

The previous prime is 28528891. The next prime is 28528957. The reversal of 28528939 is 93982582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28528939 - 2⁹ = 28528427 is a prime.

It is not a weakly prime, because it can be changed into another prime (28528979) 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, 14264469 + 14264470.

It is an arithmetic number, because the mean of its divisors is an integer number (14264470).

Almost surely, 2^28528939 is an apocalyptic number.

28528939 is a deficient number, since it is larger than the sum of its proper divisors (1).

28528939 is an equidigital number, since it uses as much as digits as its factorization.

28528939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 46.

The square root of 28528939 is about 5341.2488240111. The cubic root of 28528939 is about 305.5590891835.

The spelling of 28528939 in words is "twenty-eight million, five hundred twenty-eight thousand, nine hundred thirty-nine".