28390927 has 2 divisors, whose sum is σ = 28390928. Its totient is φ = 28390926.

The previous prime is 28390919. The next prime is 28390931. The reversal of 28390927 is 72909382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28390927 - 2³ = 28390919 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28390927.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28390127) 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, 14195463 + 14195464.

It is an arithmetic number, because the mean of its divisors is an integer number (14195464).

Almost surely, 2^28390927 is an apocalyptic number.

28390927 is a deficient number, since it is larger than the sum of its proper divisors (1).

28390927 is an equidigital number, since it uses as much as digits as its factorization.

28390927 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 28390927 is about 5328.3137107344. The cubic root of 28390927 is about 305.0655668409.

The spelling of 28390927 in words is "twenty-eight million, three hundred ninety thousand, nine hundred twenty-seven".