28313489 has 4 divisors (see below), whose sum is σ = 28403124. Its totient is φ = 28223856.

The previous prime is 28313443. The next prime is 28313503. The reversal of 28313489 is 98431382.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5798464 + 22515025 = 2408^2 + 4745^2 .

It is a cyclic number.

It is not a de Polignac number, because 28313489 - 2¹⁶ = 28247953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28313429) 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, 44342 + ... + 44975.

It is an arithmetic number, because the mean of its divisors is an integer number (7100781).

Almost surely, 2^28313489 is an apocalyptic number.

It is an amenable number.

28313489 is a deficient number, since it is larger than the sum of its proper divisors (89635).

28313489 is an equidigital number, since it uses as much as digits as its factorization.

28313489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89634.

The product of its digits is 41472, while the sum is 38.

The square root of 28313489 is about 5321.0420971836. The cubic root of 28313489 is about 304.7879525840.

The spelling of 28313489 in words is "twenty-eight million, three hundred thirteen thousand, four hundred eighty-nine".