180819618 has 64 divisors (see below), whose sum is σ = 436976640. Its totient is φ = 48727872.

The previous prime is 180819589. The next prime is 180819619. The reversal of 180819618 is 816918081.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 180819618.

It is not an unprimeable number, because it can be changed into a prime (180819619) 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 in 31 ways as a sum of consecutive naturals, for example, 276580 + ... + 277232.

It is an arithmetic number, because the mean of its divisors is an integer number (6827760).

Almost surely, 2^180819618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 180819618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218488320).

180819618 is an abundant number, since it is smaller than the sum of its proper divisors (256157022).

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

180819618 is a wasteful number, since it uses less digits than its factorization.

180819618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1031.

The product of its (nonzero) digits is 27648, while the sum is 42.

The square root of 180819618 is about 13446.9185317678. The cubic root of 180819618 is about 565.4773088261.

The spelling of 180819618 in words is "one hundred eighty million, eight hundred nineteen thousand, six hundred eighteen".