28444480 has 56 divisors (see below), whose sum is σ = 68470272. Its totient is φ = 11254272.

The previous prime is 28444469. The next prime is 28444499. The reversal of 28444480 is 8444482.

It is a congruent number.

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, 32529 + ... + 33391.

Almost surely, 2^28444480 is an apocalyptic number.

28444480 is a gapful number since it is divisible by the number (20) 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 28444480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34235136).

28444480 is an abundant number, since it is smaller than the sum of its proper divisors (40025792).

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

28444480 is a wasteful number, since it uses less digits than its factorization.

28444480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 983 (or 973 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 34.

The square root of 28444480 is about 5333.3366666656. The cubic root of 28444480 is about 305.2572585380.

The spelling of 28444480 in words is "twenty-eight million, four hundred forty-four thousand, four hundred eighty".