28386280 has 64 divisors (see below), whose sum is σ = 69753600. Its totient is φ = 10333440.

The previous prime is 28386251. The next prime is 28386307. The reversal of 28386280 is 8268382.

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, 40735 + ... + 41425.

It is an arithmetic number, because the mean of its divisors is an integer number (1089900).

Almost surely, 2^28386280 is an apocalyptic number.

28386280 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 28386280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34876800).

28386280 is an abundant number, since it is smaller than the sum of its proper divisors (41367320).

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

28386280 is a wasteful number, since it uses less digits than its factorization.

28386280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 794 (or 790 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 37.

The square root of 28386280 is about 5327.8776262223. The cubic root of 28386280 is about 305.0489216518.

The spelling of 28386280 in words is "twenty-eight million, three hundred eighty-six thousand, two hundred eighty".