28115939 has 2 divisors, whose sum is σ = 28115940. Its totient is φ = 28115938.

The previous prime is 28115897. The next prime is 28115951. The reversal of 28115939 is 93951182.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28115939 - 2¹² = 28111843 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28115999) 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, 14057969 + 14057970.

It is an arithmetic number, because the mean of its divisors is an integer number (14057970).

Almost surely, 2^28115939 is an apocalyptic number.

28115939 is a deficient number, since it is larger than the sum of its proper divisors (1).

28115939 is an equidigital number, since it uses as much as digits as its factorization.

28115939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 38.

The square root of 28115939 is about 5302.4465108099. The cubic root of 28115939 is about 304.0774379999.

The spelling of 28115939 in words is "twenty-eight million, one hundred fifteen thousand, nine hundred thirty-nine".