218089690 has 128 divisors (see below), whose sum is σ = 507225600. Its totient is φ = 67060224.

The previous prime is 218089687. The next prime is 218089699. The reversal of 218089690 is 96980812.

It is a happy number.

218089690 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×218089690² = 95126225768592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (218089699) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2987494 + ... + 2987566.

It is an arithmetic number, because the mean of its divisors is an integer number (3962700).

Almost surely, 2^218089690 is an apocalyptic number.

218089690 is an abundant number, since it is smaller than the sum of its proper divisors (289135910).

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

218089690 is a wasteful number, since it uses less digits than its factorization.

218089690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 43.

The square root of 218089690 is about 14767.8600345480. The cubic root of 218089690 is about 601.9286917520.

The spelling of 218089690 in words is "two hundred eighteen million, eighty-nine thousand, six hundred ninety".