28443688 has 64 divisors (see below), whose sum is σ = 66528000. Its totient is φ = 11100672.

The previous prime is 28443671. The next prime is 28443691. The reversal of 28443688 is 88634482.

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, 64573 + ... + 65011.

It is an arithmetic number, because the mean of its divisors is an integer number (1039500).

Almost surely, 2^28443688 is an apocalyptic number.

28443688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28443688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33264000).

28443688 is an abundant number, since it is smaller than the sum of its proper divisors (38084312).

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

28443688 is a wasteful number, since it uses less digits than its factorization.

28443688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 554 (or 550 counting only the distinct ones).

The product of its digits is 294912, while the sum is 43.

The square root of 28443688 is about 5333.2624161952. The cubic root of 28443688 is about 305.2544253463.

The spelling of 28443688 in words is "twenty-eight million, four hundred forty-three thousand, six hundred eighty-eight".