28553388 has 12 divisors (see below), whose sum is σ = 66624600. Its totient is φ = 9517792.

The previous prime is 28553383. The next prime is 28553443. The reversal of 28553388 is 88335582.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (28553383) 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 3 ways as a sum of consecutive naturals, for example, 1189713 + ... + 1189736.

It is an arithmetic number, because the mean of its divisors is an integer number (5552050).

Almost surely, 2^28553388 is an apocalyptic number.

It is an amenable number.

28553388 is an abundant number, since it is smaller than the sum of its proper divisors (38071212).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28553388 is a wasteful number, since it uses less digits than its factorization.

28553388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379456 (or 2379454 counting only the distinct ones).

The product of its digits is 230400, while the sum is 42.

The square root of 28553388 is about 5343.5370308439. The cubic root of 28553388 is about 305.6463512335.

The spelling of 28553388 in words is "twenty-eight million, five hundred fifty-three thousand, three hundred eighty-eight".