218316890 has 32 divisors (see below), whose sum is σ = 453916224. Its totient is φ = 74717440.

The previous prime is 218316881. The next prime is 218316899. The reversal of 218316890 is 98613812.

It is an interprime number because it is at equal distance from previous prime (218316881) and next prime (218316899).

It is not an unprimeable number, because it can be changed into a prime (218316899) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56504 + ... + 60243.

It is an arithmetic number, because the mean of its divisors is an integer number (14184882).

Almost surely, 2^218316890 is an apocalyptic number.

218316890 is an abundant number, since it is smaller than the sum of its proper divisors (235599334).

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

218316890 is a wasteful number, since it uses less digits than its factorization.

218316890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116782.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 218316890 is about 14775.5504127596. The cubic root of 218316890 is about 602.1376436071.

The spelling of 218316890 in words is "two hundred eighteen million, three hundred sixteen thousand, eight hundred ninety".