28808425 has 6 divisors (see below), whose sum is σ = 35722478. Its totient is φ = 23046720.

The previous prime is 28808419. The next prime is 28808431. The reversal of 28808425 is 52480882.

It is an interprime number because it is at equal distance from previous prime (28808419) and next prime (28808431).

It can be written as a sum of positive squares in 3 ways, for example, as 46656 + 28761769 = 216^2 + 5363^2 .

It is not a de Polignac number, because 28808425 - 2⁹ = 28807913 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 576144 + ... + 576193.

Almost surely, 2^28808425 is an apocalyptic number.

28808425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28808425 is a deficient number, since it is larger than the sum of its proper divisors (6914053).

28808425 is a wasteful number, since it uses less digits than its factorization.

28808425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1152347 (or 1152342 counting only the distinct ones).

The product of its (nonzero) digits is 40960, while the sum is 37.

The square root of 28808425 is about 5367.3480416310. The cubic root of 28808425 is about 306.5536596589.

The spelling of 28808425 in words is "twenty-eight million, eight hundred eight thousand, four hundred twenty-five".