28663552 has 72 divisors (see below), whose sum is σ = 61810560. Its totient is φ = 13224960.

The previous prime is 28663549. The next prime is 28663559. The reversal of 28663552 is 25536682.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28663559) 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, 345303 + ... + 345385.

It is an arithmetic number, because the mean of its divisors is an integer number (858480).

Almost surely, 2^28663552 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 28663552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30905280).

28663552 is an abundant number, since it is smaller than the sum of its proper divisors (33147008).

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

28663552 is an equidigital number, since it uses as much as digits as its factorization.

28663552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189 (or 175 counting only the distinct ones).

The product of its digits is 86400, while the sum is 37.

The square root of 28663552 is about 5353.8352608200. The cubic root of 28663552 is about 306.0389259436.

The spelling of 28663552 in words is "twenty-eight million, six hundred sixty-three thousand, five hundred fifty-two".