28389452 has 48 divisors (see below), whose sum is σ = 63823872. Its totient is φ = 10739520.

The previous prime is 28389409. The next prime is 28389467. The reversal of 28389452 is 25498382.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6677 + ... + 10067.

It is an arithmetic number, because the mean of its divisors is an integer number (1329664).

Almost surely, 2^28389452 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 28389452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31911936).

28389452 is an abundant number, since it is smaller than the sum of its proper divisors (35434420).

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

28389452 is a wasteful number, since it uses less digits than its factorization.

28389452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3438 (or 3436 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 28389452 is about 5328.1752974166. The cubic root of 28389452 is about 305.0602837035.

The spelling of 28389452 in words is "twenty-eight million, three hundred eighty-nine thousand, four hundred fifty-two".