218372090 has 16 divisors (see below), whose sum is σ = 393458688. Its totient is φ = 87262416.

The previous prime is 218372069. The next prime is 218372093. The reversal of 218372090 is 90273812.

218372090 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (218372093) 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, 359 + ... + 20901.

It is an arithmetic number, because the mean of its divisors is an integer number (24591168).

Almost surely, 2^218372090 is an apocalyptic number.

218372090 is a deficient number, since it is larger than the sum of its proper divisors (175086598).

218372090 is a wasteful number, since it uses less digits than its factorization.

218372090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21613.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 218372090 is about 14777.4182454176. The cubic root of 218372090 is about 602.1883881876.

The spelling of 218372090 in words is "two hundred eighteen million, three hundred seventy-two thousand, ninety".