28085553 has 48 divisors (see below), whose sum is σ = 46001280. Its totient is φ = 16422912.

The previous prime is 28085549. The next prime is 28085557. The reversal of 28085553 is 35558082.

28085553 is a `hidden beast` number, since 28 + 0 + 85 + 553 = 666.

It is an interprime number because it is at equal distance from previous prime (28085549) and next prime (28085557).

It is not a de Polignac number, because 28085553 - 2² = 28085549 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28085557) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 145425 + ... + 145617.

It is an arithmetic number, because the mean of its divisors is an integer number (958360).

Almost surely, 2^28085553 is an apocalyptic number.

28085553 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28085553 is a deficient number, since it is larger than the sum of its proper divisors (17915727).

28085553 is a wasteful number, since it uses less digits than its factorization.

28085553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 275 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

The square root of 28085553 is about 5299.5804550926. The cubic root of 28085553 is about 303.9678557021.

The spelling of 28085553 in words is "twenty-eight million, eighty-five thousand, five hundred fifty-three".