28539648 has 72 divisors (see below), whose sum is σ = 84417200. Its totient is φ = 9510912.

The previous prime is 28539647. The next prime is 28539677. The reversal of 28539648 is 84693582.

It is a tau number, because it is divible by the number of its divisors (72).

It is not an unprimeable number, because it can be changed into a prime (28539647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4848 + ... + 8976.

Almost surely, 2^28539648 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 28539648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42208600).

28539648 is an abundant number, since it is smaller than the sum of its proper divisors (55877552).

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

28539648 is an equidigital number, since it uses as much as digits as its factorization.

28539648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4154 (or 4134 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 28539648 is about 5342.2512108661. The cubic root of 28539648 is about 305.5973173015.

The spelling of 28539648 in words is "twenty-eight million, five hundred thirty-nine thousand, six hundred forty-eight".