180217818 has 64 divisors (see below), whose sum is σ = 451031040. Its totient is φ = 52844400.

The previous prime is 180217813. The next prime is 180217823. The reversal of 180217818 is 818712081.

It is an interprime number because it is at equal distance from previous prime (180217813) and next prime (180217823).

It is a super-2 number, since 2×180217818² = 64956923849362248, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (180217813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13521 + ... + 23307.

It is an arithmetic number, because the mean of its divisors is an integer number (7047360).

Almost surely, 2^180217818 is an apocalyptic number.

180217818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 180217818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225515520).

180217818 is an abundant number, since it is smaller than the sum of its proper divisors (270813222).

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

180217818 is a wasteful number, since it uses less digits than its factorization.

180217818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9840 (or 9834 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 36.

The square root of 180217818 is about 13424.5230082860. The cubic root of 180217818 is about 564.8492750635.

Adding to 180217818 its reverse (818712081), we get a palindrome (998929899).

The spelling of 180217818 in words is "one hundred eighty million, two hundred seventeen thousand, eight hundred eighteen".