218022858 has 24 divisors (see below), whose sum is σ = 500170788. Its totient is φ = 68399232.

The previous prime is 218022829. The next prime is 218022869. The reversal of 218022858 is 858220812.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 209004849 + 9018009 = 14457^2 + 3003^2 .

It is a super-2 number, since 2×218022858² = 95067933220976328, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 355941 + ... + 356552.

Almost surely, 2^218022858 is an apocalyptic number.

218022858 is an abundant number, since it is smaller than the sum of its proper divisors (282147930).

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

218022858 is a wasteful number, since it uses less digits than its factorization.

218022858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712518 (or 712515 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 218022858 is about 14765.5971094975. The cubic root of 218022858 is about 601.8671999131.

The spelling of 218022858 in words is "two hundred eighteen million, twenty-two thousand, eight hundred fifty-eight".