28825289 has 4 divisors (see below), whose sum is σ = 28899780. Its totient is φ = 28750800.

The previous prime is 28825273. The next prime is 28825297. The reversal of 28825289 is 98252882.

It is a happy number.

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 9815689 + 19009600 = 3133^2 + 4360^2 .

It is a cyclic number.

It is not a de Polignac number, because 28825289 - 2⁴ = 28825273 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28825229) 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, 36662 + ... + 37439.

It is an arithmetic number, because the mean of its divisors is an integer number (7224945).

Almost surely, 2^28825289 is an apocalyptic number.

It is an amenable number.

28825289 is a deficient number, since it is larger than the sum of its proper divisors (74491).

28825289 is an equidigital number, since it uses as much as digits as its factorization.

28825289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74490.

The product of its digits is 184320, while the sum is 44.

The square root of 28825289 is about 5368.9187924572. The cubic root of 28825289 is about 306.6134652249.

The spelling of 28825289 in words is "twenty-eight million, eight hundred twenty-five thousand, two hundred eighty-nine".