218131960 has 32 divisors (see below), whose sum is σ = 492593760. Its totient is φ = 86933376.

The previous prime is 218131933. The next prime is 218132009. The reversal of 218131960 is 69131812.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1237 + ... + 20923.

It is an arithmetic number, because the mean of its divisors is an integer number (15393555).

Almost surely, 2^218131960 is an apocalyptic number.

218131960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218131960 is an abundant number, since it is smaller than the sum of its proper divisors (274461800).

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

218131960 is a wasteful number, since it uses less digits than its factorization.

218131960 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19975 (or 19971 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 31.

The square root of 218131960 is about 14769.2911136588. The cubic root of 218131960 is about 601.9675777140.

The spelling of 218131960 in words is "two hundred eighteen million, one hundred thirty-one thousand, nine hundred sixty".