218881380 has 48 divisors (see below), whose sum is σ = 613650240. Its totient is φ = 58293888.

The previous prime is 218881343. The next prime is 218881391. The reversal of 218881380 is 83188812.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57991 + ... + 61649.

It is an arithmetic number, because the mean of its divisors is an integer number (12784380).

Almost surely, 2^218881380 is an apocalyptic number.

218881380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218881380 is an abundant number, since it is smaller than the sum of its proper divisors (394768860).

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

218881380 is a wasteful number, since it uses less digits than its factorization.

218881380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4668 (or 4666 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 39.

The square root of 218881380 is about 14794.6402457106. The cubic root of 218881380 is about 602.6561683753.

The spelling of 218881380 in words is "two hundred eighteen million, eight hundred eighty-one thousand, three hundred eighty".