28905549 has 8 divisors (see below), whose sum is σ = 40216512. Its totient is φ = 18432480.

The previous prime is 28905469. The next prime is 28905557. The reversal of 28905549 is 94550982.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28905549 - 2⁷ = 28905421 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28905549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28905599) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 209392 + ... + 209529.

It is an arithmetic number, because the mean of its divisors is an integer number (5027064).

Almost surely, 2^28905549 is an apocalyptic number.

It is an amenable number.

28905549 is a deficient number, since it is larger than the sum of its proper divisors (11310963).

28905549 is a wasteful number, since it uses less digits than its factorization.

28905549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 418947.

The product of its (nonzero) digits is 129600, while the sum is 42.

The square root of 28905549 is about 5376.3880998306. The cubic root of 28905549 is about 306.8977756680.

The spelling of 28905549 in words is "twenty-eight million, nine hundred five thousand, five hundred forty-nine".