28270489 has 9 divisors (see below), whose sum is σ = 30687453. Its totient is φ = 26032032.

The previous prime is 28270471. The next prime is 28270523. The reversal of 28270489 is 98407282.

The square root of 28270489 is 5317.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 265225 + 28005264 = 515^2 + 5292^2 .

It is not a de Polignac number, because 28270489 - 2⁵ = 28270457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28270189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 68917 + ... + 69325.

It is an arithmetic number, because the mean of its divisors is an integer number (3409717).

Almost surely, 2^28270489 is an apocalyptic number.

28270489 is the 5317-th square number.

28270489 is the 2659-th centered octagonal number.

It is an amenable number.

28270489 is a deficient number, since it is larger than the sum of its proper divisors (2416964).

28270489 is an frugal number, since it uses more digits than its factorization.

28270489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 844 (or 422 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The cubic root of 28270489 is about 304.6335794953.

The spelling of 28270489 in words is "twenty-eight million, two hundred seventy thousand, four hundred eighty-nine".