218342280 has 128 divisors (see below), whose sum is σ = 716284800. Its totient is φ = 52918272.
The previous prime is 218342239. The next prime is 218342287. The reversal of 218342280 is 82243812.
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 (218342287) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (11) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 103476 + ... + 105564.
It is an arithmetic number, because the mean of its divisors is an integer number (5595975).
Almost surely, 2218342280 is an apocalyptic number.
218342280 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 218342280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (358142400).
218342280 is an abundant number, since it is smaller than the sum of its proper divisors (497942520).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
218342280 is a wasteful number, since it uses less digits than its factorization.
218342280 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2183 (or 2179 counting only the distinct ones).
The product of its (nonzero) digits is 6144, while the sum is 30.
The square root of 218342280 is about 14776.4095774312. The cubic root of 218342280 is about 602.1609853378.
The spelling of 218342280 in words is "two hundred eighteen million, three hundred forty-two thousand, two hundred eighty".
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