28340880 has 80 divisors (see below), whose sum is σ = 88387200. Its totient is φ = 7512064.

The previous prime is 28340861. The next prime is 28340911. The reversal of 28340880 is 8804382.

It is a tau number, because it is divible by the number of its divisors (80).

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, 62896 + ... + 63344.

It is an arithmetic number, because the mean of its divisors is an integer number (1104840).

Almost surely, 2^28340880 is an apocalyptic number.

28340880 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 28340880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44193600).

28340880 is an abundant number, since it is smaller than the sum of its proper divisors (60046320).

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

28340880 is a wasteful number, since it uses less digits than its factorization.

28340880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728 (or 722 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 28340880 is about 5323.6153129241. The cubic root of 28340880 is about 304.8862067660.

The spelling of 28340880 in words is "twenty-eight million, three hundred forty thousand, eight hundred eighty".