28388544 has 56 divisors (see below), whose sum is σ = 75590400. Its totient is φ = 9402624.

The previous prime is 28388539. The next prime is 28388567. The reversal of 28388544 is 44588382.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 28388496 and 28388505.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37837 + ... + 38579.

Almost surely, 2^28388544 is an apocalyptic number.

28388544 is a gapful number since it is divisible by the number (24) 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 28388544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37795200).

28388544 is an abundant number, since it is smaller than the sum of its proper divisors (47201856).

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

28388544 is a wasteful number, since it uses less digits than its factorization.

28388544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 957 (or 947 counting only the distinct ones).

The product of its digits is 245760, while the sum is 42.

The square root of 28388544 is about 5328.0900893284. The cubic root of 28388544 is about 305.0570313490.

The spelling of 28388544 in words is "twenty-eight million, three hundred eighty-eight thousand, five hundred forty-four".