218640082 has 4 divisors (see below), whose sum is σ = 327960126. Its totient is φ = 109320040.

The previous prime is 218640073. The next prime is 218640089. The reversal of 218640082 is 280046812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 132503121 + 86136961 = 11511^2 + 9281^2 .

It is not an unprimeable number, because it can be changed into a prime (218640089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54660019 + ... + 54660022.

Almost surely, 2^218640082 is an apocalyptic number.

218640082 is a deficient number, since it is larger than the sum of its proper divisors (109320044).

218640082 is a wasteful number, since it uses less digits than its factorization.

218640082 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109320043.

The product of its (nonzero) digits is 6144, while the sum is 31.

The square root of 218640082 is about 14786.4830842226. The cubic root of 218640082 is about 602.4346279859.

Adding to 218640082 its reverse (280046812), we get a palindrome (498686894).

The spelling of 218640082 in words is "two hundred eighteen million, six hundred forty thousand, eighty-two".