28381080 has 256 divisors, whose sum is σ = 110315520. Its totient is φ = 5677056.

The previous prime is 28381069. The next prime is 28381081. The reversal of 28381080 is 8018382.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28381081) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 251104 + ... + 251216.

It is an arithmetic number, because the mean of its divisors is an integer number (430920).

Almost surely, 2^28381080 is an apocalyptic number.

28381080 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 28381080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (55157760).

28381080 is an abundant number, since it is smaller than the sum of its proper divisors (81934440).

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

28381080 is a wasteful number, since it uses less digits than its factorization.

28381080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170 (or 166 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 28381080 is about 5327.3896046751. The cubic root of 28381080 is about 305.0302935063.

The spelling of 28381080 in words is "twenty-eight million, three hundred eighty-one thousand, eighty".