218147860 has 48 divisors (see below), whose sum is σ = 541618560. Its totient is φ = 72213120.

The previous prime is 218147857. The next prime is 218147861. The reversal of 218147860 is 68741812.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218147861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22806 + ... + 30925.

It is an arithmetic number, because the mean of its divisors is an integer number (11283720).

Almost surely, 2^218147860 is an apocalyptic number.

218147860 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218147860 is an abundant number, since it is smaller than the sum of its proper divisors (323470700).

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

218147860 is a wasteful number, since it uses less digits than its factorization.

218147860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53776 (or 53774 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 218147860 is about 14769.8293829008. The cubic root of 218147860 is about 601.9822034967.

The spelling of 218147860 in words is "two hundred eighteen million, one hundred forty-seven thousand, eight hundred sixty".