28285519 has 4 divisors (see below), whose sum is σ = 28316520. Its totient is φ = 28254520.

The previous prime is 28285513. The next prime is 28285541. The reversal of 28285519 is 91558282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28285519 - 2³ = 28285511 is a prime.

It is a super-2 number, since 2×28285519² = 1600141170198722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28285511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14089 + ... + 15970.

It is an arithmetic number, because the mean of its divisors is an integer number (7079130).

Almost surely, 2^28285519 is an apocalyptic number.

28285519 is a deficient number, since it is larger than the sum of its proper divisors (31001).

28285519 is an equidigital number, since it uses as much as digits as its factorization.

28285519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31000.

The product of its digits is 57600, while the sum is 40.

The square root of 28285519 is about 5318.4132032026. The cubic root of 28285519 is about 304.6875560587.

The spelling of 28285519 in words is "twenty-eight million, two hundred eighty-five thousand, five hundred nineteen".