28253885 has 16 divisors (see below), whose sum is σ = 37340352. Its totient is φ = 20352000.

The previous prime is 28253857. The next prime is 28253887. The reversal of 28253885 is 58835282.

It is not a de Polignac number, because 28253885 - 2¹⁴ = 28237501 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28253887) 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 15 ways as a sum of consecutive naturals, for example, 3485 + ... + 8285.

It is an arithmetic number, because the mean of its divisors is an integer number (2333772).

Almost surely, 2^28253885 is an apocalyptic number.

It is an amenable number.

28253885 is a deficient number, since it is larger than the sum of its proper divisors (9086467).

28253885 is a wasteful number, since it uses less digits than its factorization.

28253885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4924.

The product of its digits is 153600, while the sum is 41.

The square root of 28253885 is about 5315.4383638605. The cubic root of 28253885 is about 304.5739280506.

The spelling of 28253885 in words is "twenty-eight million, two hundred fifty-three thousand, eight hundred eighty-five".