28444880 has 40 divisors (see below), whose sum is σ = 66772512. Its totient is φ = 11268224.

The previous prime is 28444877. The next prime is 28444883. The reversal of 28444880 is 8844482.

It is an interprime number because it is at equal distance from previous prime (28444877) and next prime (28444883).

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×28444880² = 1618222396428800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28444883) 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, 6899 + ... + 10221.

Almost surely, 2^28444880 is an apocalyptic number.

28444880 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 28444880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33386256).

28444880 is an abundant number, since it is smaller than the sum of its proper divisors (38327632).

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

28444880 is a wasteful number, since it uses less digits than its factorization.

28444880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3443 (or 3437 counting only the distinct ones).

The product of its (nonzero) digits is 65536, while the sum is 38.

The square root of 28444880 is about 5333.3741665104. The cubic root of 28444880 is about 305.2586894229.

The spelling of 28444880 in words is "twenty-eight million, four hundred forty-four thousand, eight hundred eighty".