28430880 has 96 divisors (see below), whose sum is σ = 91119168. Its totient is φ = 7449600.

The previous prime is 28430873. The next prime is 28430929. The reversal of 28430880 is 8803482.

It is a tau number, because it is divible by the number of its divisors (96).

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, 28795 + ... + 29765.

It is an arithmetic number, because the mean of its divisors is an integer number (949158).

Almost surely, 2^28430880 is an apocalyptic number.

28430880 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 28430880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45559584).

28430880 is an abundant number, since it is smaller than the sum of its proper divisors (62688288).

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

28430880 is a wasteful number, since it uses less digits than its factorization.

28430880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1050 (or 1042 counting only the distinct ones).

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

The square root of 28430880 is about 5332.0615150240. The cubic root of 28430880 is about 305.2086004675.

The spelling of 28430880 in words is "twenty-eight million, four hundred thirty thousand, eight hundred eighty".