28969856 has 32 divisors (see below), whose sum is σ = 58384800. Its totient is φ = 14316544.

The previous prime is 28969849. The next prime is 28969859. The reversal of 28969856 is 65896982.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 28969798 and 28969807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28969859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10121 + ... + 12663.

It is an arithmetic number, because the mean of its divisors is an integer number (1824525).

Almost surely, 2^28969856 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 28969856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29192400).

28969856 is an abundant number, since it is smaller than the sum of its proper divisors (29414944).

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

28969856 is an equidigital number, since it uses as much as digits as its factorization.

28969856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2646 (or 2634 counting only the distinct ones).

The product of its digits is 1866240, while the sum is 53.

The square root of 28969856 is about 5382.3652793173. The cubic root of 28969856 is about 307.1251951831.

The spelling of 28969856 in words is "twenty-eight million, nine hundred sixty-nine thousand, eight hundred fifty-six".