218287240 has 16 divisors (see below), whose sum is σ = 491146380. Its totient is φ = 87314880.

The previous prime is 218287217. The next prime is 218287241. The reversal of 218287240 is 42782812.

218287240 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 217444516 + 842724 = 14746^2 + 918^2 .

It is a junction number, because it is equal to n+sod(n) for n = 218287196 and 218287205.

It is not an unprimeable number, because it can be changed into a prime (218287241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2728551 + ... + 2728630.

Almost surely, 2^218287240 is an apocalyptic number.

218287240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

218287240 is an abundant number, since it is smaller than the sum of its proper divisors (272859140).

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

218287240 is a wasteful number, since it uses less digits than its factorization.

218287240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5457192 (or 5457188 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 218287240 is about 14774.5470319736. The cubic root of 218287240 is about 602.1103832496.

The spelling of 218287240 in words is "two hundred eighteen million, two hundred eighty-seven thousand, two hundred forty".