28085619 has 4 divisors (see below), whose sum is σ = 37447496. Its totient is φ = 18723744.

The previous prime is 28085609. The next prime is 28085633. The reversal of 28085619 is 91658082.

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

It is not a de Polignac number, because 28085619 - 2¹² = 28081523 is a prime.

It is a super-2 number, since 2×28085619² = 1577603989226322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28085609) 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, 4680934 + ... + 4680939.

It is an arithmetic number, because the mean of its divisors is an integer number (9361874).

Almost surely, 2^28085619 is an apocalyptic number.

28085619 is a deficient number, since it is larger than the sum of its proper divisors (9361877).

28085619 is an equidigital number, since it uses as much as digits as its factorization.

28085619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9361876.

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 28085619 is about 5299.5866819970. The cubic root of 28085619 is about 303.9680938063.

It can be divided in two parts, 280856 and 19, that added together give a triangular number (280875 = T₇₄₉).

The spelling of 28085619 in words is "twenty-eight million, eighty-five thousand, six hundred nineteen".