28302889 has 4 divisors (see below), whose sum is σ = 28337860. Its totient is φ = 28267920.

The previous prime is 28302851. The next prime is 28302899. The reversal of 28302889 is 98820382.

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 15342889 + 12960000 = 3917^2 + 3600^2 .

It is a cyclic number.

It is not a de Polignac number, because 28302889 - 2¹⁷ = 28171817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28302809) 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, 16242 + ... + 17899.

It is an arithmetic number, because the mean of its divisors is an integer number (7084465).

Almost surely, 2^28302889 is an apocalyptic number.

It is an amenable number.

28302889 is a deficient number, since it is larger than the sum of its proper divisors (34971).

28302889 is an equidigital number, since it uses as much as digits as its factorization.

28302889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34970.

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 28302889 is about 5320.0459584481. The cubic root of 28302889 is about 304.7499123463.

The spelling of 28302889 in words is "twenty-eight million, three hundred two thousand, eight hundred eighty-nine".