218630874 has 32 divisors (see below), whose sum is σ = 545158656. Its totient is φ = 56787120.

The previous prime is 218630873. The next prime is 218630899. The reversal of 218630874 is 478036812.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (218630873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236152 + ... + 237075.

It is an arithmetic number, because the mean of its divisors is an integer number (17036208).

Almost surely, 2^218630874 is an apocalyptic number.

218630874 is an abundant number, since it is smaller than the sum of its proper divisors (326527782).

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

218630874 is a wasteful number, since it uses less digits than its factorization.

218630874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473250.

The product of its (nonzero) digits is 64512, while the sum is 39.

The square root of 218630874 is about 14786.1717154915. The cubic root of 218630874 is about 602.4261707139.

The spelling of 218630874 in words is "two hundred eighteen million, six hundred thirty thousand, eight hundred seventy-four".