28118280 has 32 divisors (see below), whose sum is σ = 84355200. Its totient is φ = 7498176.

The previous prime is 28118257. The next prime is 28118287. The reversal of 28118280 is 8281182.

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

It is not an unprimeable number, because it can be changed into a prime (28118287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117040 + ... + 117279.

It is an arithmetic number, because the mean of its divisors is an integer number (2636100).

Almost surely, 2^28118280 is an apocalyptic number.

28118280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28118280 is an abundant number, since it is smaller than the sum of its proper divisors (56236920).

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

28118280 is a wasteful number, since it uses less digits than its factorization.

28118280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234333 (or 234329 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 28118280 is about 5302.6672533735. The cubic root of 28118280 is about 304.0858771694.

The spelling of 28118280 in words is "twenty-eight million, one hundred eighteen thousand, two hundred eighty".