28185319 has 2 divisors, whose sum is σ = 28185320. Its totient is φ = 28185318.

The previous prime is 28185317. The next prime is 28185331. The reversal of 28185319 is 91358182.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28185319 - 2¹ = 28185317 is a prime.

It is a super-2 number, since 2×28185319² = 1588824414263522, which contains 22 as substring.

Together with 28185317, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28185317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14092659 + 14092660.

It is an arithmetic number, because the mean of its divisors is an integer number (14092660).

Almost surely, 2^28185319 is an apocalyptic number.

28185319 is a deficient number, since it is larger than the sum of its proper divisors (1).

28185319 is an equidigital number, since it uses as much as digits as its factorization.

28185319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17280, while the sum is 37.

The square root of 28185319 is about 5308.9847428675. The cubic root of 28185319 is about 304.3273503743.

It can be divided in two parts, 2 and 8185319, that added together give a square (8185321 = 2861²).

The spelling of 28185319 in words is "twenty-eight million, one hundred eighty-five thousand, three hundred nineteen".