28218260 has 48 divisors (see below), whose sum is σ = 69019776. Its totient is φ = 9489792.

The previous prime is 28218259. The next prime is 28218269. The reversal of 28218260 is 6281282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28218269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5519 + ... + 9321.

It is an arithmetic number, because the mean of its divisors is an integer number (1437912).

Almost surely, 2^28218260 is an apocalyptic number.

28218260 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 28218260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34509888).

28218260 is an abundant number, since it is smaller than the sum of its proper divisors (40801516).

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

28218260 is a wasteful number, since it uses less digits than its factorization.

28218260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3872 (or 3870 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 28218260 is about 5312.0862191798. The cubic root of 28218260 is about 304.4458629510.

The spelling of 28218260 in words is "twenty-eight million, two hundred eighteen thousand, two hundred sixty".