28855391 has 2 divisors, whose sum is σ = 28855392. Its totient is φ = 28855390.

The previous prime is 28855381. The next prime is 28855403. The reversal of 28855391 is 19355882.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28855391 - 2¹⁰ = 28854367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28855381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14427695 + 14427696.

It is an arithmetic number, because the mean of its divisors is an integer number (14427696).

Almost surely, 2^28855391 is an apocalyptic number.

28855391 is a deficient number, since it is larger than the sum of its proper divisors (1).

28855391 is an equidigital number, since it uses as much as digits as its factorization.

28855391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 86400, while the sum is 41.

The square root of 28855391 is about 5371.7214186888. The cubic root of 28855391 is about 306.7201593569.

The spelling of 28855391 in words is "twenty-eight million, eight hundred fifty-five thousand, three hundred ninety-one".