28389619 has 4 divisors (see below), whose sum is σ = 29156944. Its totient is φ = 27622296.

The previous prime is 28389617. The next prime is 28389623. The reversal of 28389619 is 91698382.

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 28389619 - 2¹ = 28389617 is a prime.

It is a super-2 number, since 2×28389619² = 1611940933930322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28389617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383607 + ... + 383680.

It is an arithmetic number, because the mean of its divisors is an integer number (7289236).

Almost surely, 2^28389619 is an apocalyptic number.

28389619 is a deficient number, since it is larger than the sum of its proper divisors (767325).

28389619 is an equidigital number, since it uses as much as digits as its factorization.

28389619 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 767324.

The product of its digits is 186624, while the sum is 46.

The square root of 28389619 is about 5328.1909687998. The cubic root of 28389619 is about 305.0608818713.

The spelling of 28389619 in words is "twenty-eight million, three hundred eighty-nine thousand, six hundred nineteen".