28884880 has 40 divisors (see below), whose sum is σ = 67709952. Its totient is φ = 11458944.

The previous prime is 28884871. The next prime is 28884881. The reversal of 28884880 is 8848882.

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

It is a super-2 number, since 2×28884880² = 1668672585228800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28884880.

It is not an unprimeable number, because it can be changed into a prime (28884881) 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, 8739 + ... + 11581.

Almost surely, 2^28884880 is an apocalyptic number.

28884880 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 28884880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33854976).

28884880 is an abundant number, since it is smaller than the sum of its proper divisors (38825072).

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

28884880 is a wasteful number, since it uses less digits than its factorization.

28884880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983 (or 2977 counting only the distinct ones).

The product of its (nonzero) digits is 262144, while the sum is 46.

The square root of 28884880 is about 5374.4655548250. The cubic root of 28884880 is about 306.8246088324.

The spelling of 28884880 in words is "twenty-eight million, eight hundred eighty-four thousand, eight hundred eighty".