28145089 has 4 divisors (see below), whose sum is σ = 32165824. Its totient is φ = 24124356.

The previous prime is 28145087. The next prime is 28145101. The reversal of 28145089 is 98054182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98054182 = 2 ⋅49027091.

It is a cyclic number.

It is not a de Polignac number, because 28145089 - 2¹ = 28145087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28145083) 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, 2010357 + ... + 2010370.

It is an arithmetic number, because the mean of its divisors is an integer number (8041456).

Almost surely, 2^28145089 is an apocalyptic number.

It is an amenable number.

28145089 is a deficient number, since it is larger than the sum of its proper divisors (4020735).

28145089 is an equidigital number, since it uses as much as digits as its factorization.

28145089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4020734.

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 28145089 is about 5305.1945298924. The cubic root of 28145089 is about 304.1824886830.

The spelling of 28145089 in words is "twenty-eight million, one hundred forty-five thousand, eighty-nine".