28404885 has 32 divisors (see below), whose sum is σ = 47755008. Its totient is φ = 14389760.

The previous prime is 28404881. The next prime is 28404919. The reversal of 28404885 is 58840482.

It is not a de Polignac number, because 28404885 - 2² = 28404881 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28404881) 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 31 ways as a sum of consecutive naturals, for example, 96799 + ... + 97091.

It is an arithmetic number, because the mean of its divisors is an integer number (1492344).

Almost surely, 2^28404885 is an apocalyptic number.

It is an amenable number.

28404885 is a deficient number, since it is larger than the sum of its proper divisors (19350123).

28404885 is a wasteful number, since it uses less digits than its factorization.

28404885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 605.

The product of its (nonzero) digits is 81920, while the sum is 39.

The square root of 28404885 is about 5329.6233450404. The cubic root of 28404885 is about 305.1155523822.

The spelling of 28404885 in words is "twenty-eight million, four hundred four thousand, eight hundred eighty-five".