218164028 has 6 divisors (see below), whose sum is σ = 381787056. Its totient is φ = 109082012.

The previous prime is 218164021. The next prime is 218164033. The reversal of 218164028 is 820461812.

It is a happy number.

It is a super-2 number, since 2×218164028² = 95191086226369568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 218163985 and 218164003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (218164021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27270500 + ... + 27270507.

It is an arithmetic number, because the mean of its divisors is an integer number (63631176).

Almost surely, 2^218164028 is an apocalyptic number.

It is an amenable number.

218164028 is a deficient number, since it is larger than the sum of its proper divisors (163623028).

218164028 is a wasteful number, since it uses less digits than its factorization.

218164028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54541011 (or 54541009 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 218164028 is about 14770.3767047425. The cubic root of 218164028 is about 601.9970750733.

The spelling of 218164028 in words is "two hundred eighteen million, one hundred sixty-four thousand, twenty-eight".