28278113 has 2 divisors, whose sum is σ = 28278114. Its totient is φ = 28278112.

The previous prime is 28278091. The next prime is 28278121. The reversal of 28278113 is 31187282.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21967969 + 6310144 = 4687^2 + 2512^2 .

It is a cyclic number.

It is not a de Polignac number, because 28278113 - 2⁶ = 28278049 is a prime.

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 28278113.

It is not a weakly prime, because it can be changed into another prime (28278013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14139056 + 14139057.

It is an arithmetic number, because the mean of its divisors is an integer number (14139057).

Almost surely, 2^28278113 is an apocalyptic number.

It is an amenable number.

28278113 is a deficient number, since it is larger than the sum of its proper divisors (1).

28278113 is an equidigital number, since it uses as much as digits as its factorization.

28278113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5376, while the sum is 32.

The square root of 28278113 is about 5317.7168973160. The cubic root of 28278113 is about 304.6609616141.

The spelling of 28278113 in words is "twenty-eight million, two hundred seventy-eight thousand, one hundred thirteen".