218630872 has 32 divisors (see below), whose sum is σ = 438840000. Its totient is φ = 101802528.

The previous prime is 218630843. The next prime is 218630873. The reversal of 218630872 is 278036812.

It is a congruent number.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3222 + ... + 21157.

It is an arithmetic number, because the mean of its divisors is an integer number (13713750).

Almost surely, 2^218630872 is an apocalyptic number.

It is an amenable number.

218630872 is an abundant number, since it is smaller than the sum of its proper divisors (220209128).

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

218630872 is a wasteful number, since it uses less digits than its factorization.

218630872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24463 (or 24459 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 37.

The square root of 218630872 is about 14786.1716478607. The cubic root of 218630872 is about 602.4261688769.

The spelling of 218630872 in words is "two hundred eighteen million, six hundred thirty thousand, eight hundred seventy-two".