218871090 has 48 divisors (see below), whose sum is σ = 602543448. Its totient is φ = 54931968.

The previous prime is 218871077. The next prime is 218871119. The reversal of 218871090 is 90178812.

218871090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 218477961 + 393129 = 14781^2 + 627^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69997 + ... + 73056.

Almost surely, 2^218871090 is an apocalyptic number.

218871090 is an abundant number, since it is smaller than the sum of its proper divisors (383672358).

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

218871090 is a wasteful number, since it uses less digits than its factorization.

218871090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143083 (or 143080 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 218871090 is about 14794.2924805480. The cubic root of 218871090 is about 602.6467242506.

The spelling of 218871090 in words is "two hundred eighteen million, eight hundred seventy-one thousand, ninety".