28112280 has 128 divisors (see below), whose sum is σ = 98496000. Its totient is φ = 6416256.

The previous prime is 28112221. The next prime is 28112291. The reversal of 28112280 is 8221182.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 28112280.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 40819 + ... + 41501.

It is an arithmetic number, because the mean of its divisors is an integer number (769500).

Almost surely, 2^28112280 is an apocalyptic number.

28112280 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 28112280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49248000).

28112280 is an abundant number, since it is smaller than the sum of its proper divisors (70383720).

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

28112280 is a wasteful number, since it uses less digits than its factorization.

28112280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718 (or 700 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 28112280 is about 5302.1014701720. The cubic root of 28112280 is about 304.0642465783.

It can be divided in two parts, 281 and 12280, that added together give a triangular number (12561 = T₁₅₈).

The spelling of 28112280 in words is "twenty-eight million, one hundred twelve thousand, two hundred eighty".