28908481 has 12 divisors (see below), whose sum is σ = 35399280. Its totient is φ = 23473800.

The previous prime is 28908469. The next prime is 28908487. The reversal of 28908481 is 18480982.

It is not a de Polignac number, because 28908481 - 2¹¹ = 28906433 is a prime.

It is a super-2 number, since 2×28908481² = 1671400547454722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28908487) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14595 + ... + 16456.

It is an arithmetic number, because the mean of its divisors is an integer number (2949940).

Almost surely, 2^28908481 is an apocalyptic number.

It is an amenable number.

28908481 is a deficient number, since it is larger than the sum of its proper divisors (6490799).

28908481 is a wasteful number, since it uses less digits than its factorization.

28908481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31084 (or 31077 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The square root of 28908481 is about 5376.6607666841. The cubic root of 28908481 is about 306.9081519208.

The spelling of 28908481 in words is "twenty-eight million, nine hundred eight thousand, four hundred eighty-one".