28389856 has 48 divisors (see below), whose sum is σ = 62052480. Its totient is φ = 12676480.

The previous prime is 28389853. The next prime is 28389877. The reversal of 28389856 is 65898382.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28389853) 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, 20085 + ... + 21451.

It is an arithmetic number, because the mean of its divisors is an integer number (1292760).

Almost surely, 2^28389856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28389856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31026240).

28389856 is an abundant number, since it is smaller than the sum of its proper divisors (33662624).

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

28389856 is a wasteful number, since it uses less digits than its factorization.

28389856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1447 (or 1439 counting only the distinct ones).

The product of its digits is 829440, while the sum is 49.

The square root of 28389856 is about 5328.2132089473. The cubic root of 28389856 is about 305.0617307641.

The spelling of 28389856 in words is "twenty-eight million, three hundred eighty-nine thousand, eight hundred fifty-six".