28555939 has 2 divisors, whose sum is σ = 28555940. Its totient is φ = 28555938.

The previous prime is 28555907. The next prime is 28555963. The reversal of 28555939 is 93955582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28555939 - 2⁵ = 28555907 is a prime.

It is not a weakly prime, because it can be changed into another prime (28555979) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14277969 + 14277970.

It is an arithmetic number, because the mean of its divisors is an integer number (14277970).

Almost surely, 2^28555939 is an apocalyptic number.

28555939 is a deficient number, since it is larger than the sum of its proper divisors (1).

28555939 is an equidigital number, since it uses as much as digits as its factorization.

28555939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 486000, while the sum is 46.

The square root of 28555939 is about 5343.7757250843. The cubic root of 28555939 is about 305.6554532547.

The spelling of 28555939 in words is "twenty-eight million, five hundred fifty-five thousand, nine hundred thirty-nine".