218032506 has 32 divisors (see below), whose sum is σ = 496339200. Its totient is φ = 70904160.

The previous prime is 218032501. The next prime is 218032519. The reversal of 218032506 is 605230812.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 218032506.

It is not an unprimeable number, because it can be changed into a prime (218032501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47026 + ... + 51453.

It is an arithmetic number, because the mean of its divisors is an integer number (15510600).

Almost surely, 2^218032506 is an apocalyptic number.

218032506 is an abundant number, since it is smaller than the sum of its proper divisors (278306694).

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

218032506 is a wasteful number, since it uses less digits than its factorization.

218032506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98531 (or 98525 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 27.

The square root of 218032506 is about 14765.9238112622. The cubic root of 218032506 is about 601.8760777729.

The spelling of 218032506 in words is "two hundred eighteen million, thirty-two thousand, five hundred six".