218486380 has 48 divisors (see below), whose sum is σ = 555218496. Its totient is φ = 70502400.

The previous prime is 218486347. The next prime is 218486393. The reversal of 218486380 is 83684812.

218486380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, 43521 + ... + 48280.

It is an arithmetic number, because the mean of its divisors is an integer number (11567052).

Almost surely, 2^218486380 is an apocalyptic number.

218486380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218486380 is an abundant number, since it is smaller than the sum of its proper divisors (336732116).

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

218486380 is a wasteful number, since it uses less digits than its factorization.

218486380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91834 (or 91832 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 40.

The square root of 218486380 is about 14781.2847885426. The cubic root of 218486380 is about 602.2934261948.

The spelling of 218486380 in words is "two hundred eighteen million, four hundred eighty-six thousand, three hundred eighty".