218742864 has 20 divisors (see below), whose sum is σ = 565085856. Its totient is φ = 72914272.

The previous prime is 218742847. The next prime is 218742907. The reversal of 218742864 is 468247812.

218742864 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2278524 + ... + 2278619.

Almost surely, 2^218742864 is an apocalyptic number.

218742864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

218742864 is an abundant number, since it is smaller than the sum of its proper divisors (346342992).

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

218742864 is a wasteful number, since it uses less digits than its factorization.

218742864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4557154 (or 4557148 counting only the distinct ones).

The product of its digits is 172032, while the sum is 42.

The square root of 218742864 is about 14789.9582149511. The cubic root of 218742864 is about 602.5290140582.

The spelling of 218742864 in words is "two hundred eighteen million, seven hundred forty-two thousand, eight hundred sixty-four".