28055387 has 2 divisors, whose sum is σ = 28055388. Its totient is φ = 28055386.

The previous prime is 28055333. The next prime is 28055413. The reversal of 28055387 is 78355082.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28055387 - 2¹⁰ = 28054363 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 28055387.

It is not a weakly prime, because it can be changed into another prime (28055317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14027693 + 14027694.

It is an arithmetic number, because the mean of its divisors is an integer number (14027694).

Almost surely, 2^28055387 is an apocalyptic number.

28055387 is a deficient number, since it is larger than the sum of its proper divisors (1).

28055387 is an equidigital number, since it uses as much as digits as its factorization.

28055387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 28055387 is about 5296.7336161072. The cubic root of 28055387 is about 303.8589885893.

It can be divided in two parts, 2805 and 5387, that added together give a 13-th power (8192 = 2¹³).

The spelling of 28055387 in words is "twenty-eight million, fifty-five thousand, three hundred eighty-seven".