28490089 has 4 divisors (see below), whose sum is σ = 28615824. Its totient is φ = 28364356.

The previous prime is 28490087. The next prime is 28490107. The reversal of 28490089 is 98009482.

It is a happy number.

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: 98009482 = 2 ⋅49004741.

It is a cyclic number.

It is not a de Polignac number, because 28490089 - 2¹ = 28490087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28490083) 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, 62527 + ... + 62980.

It is an arithmetic number, because the mean of its divisors is an integer number (7153956).

Almost surely, 2^28490089 is an apocalyptic number.

It is an amenable number.

28490089 is a deficient number, since it is larger than the sum of its proper divisors (125735).

28490089 is a wasteful number, since it uses less digits than its factorization.

28490089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125734.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 28490089 is about 5337.6107951030. The cubic root of 28490089 is about 305.4203252518.

The spelling of 28490089 in words is "twenty-eight million, four hundred ninety thousand, eighty-nine".