180644 has 6 divisors (see below), whose sum is σ = 316134. Its totient is φ = 90320.

The previous prime is 180629. The next prime is 180647. The reversal of 180644 is 446081.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 168100 + 12544 = 410^2 + 112^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 180644.

It is not an unprimeable number, because it can be changed into a prime (180647) by changing a digit.

180644 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22577 + ... + 22584.

It is an arithmetic number, because the mean of its divisors is an integer number (52689).

2¹⁸⁰⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

180644 is a deficient number, since it is larger than the sum of its proper divisors (135490).

180644 is a wasteful number, since it uses less digits than its factorization.

180644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45165 (or 45163 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 180644 is about 425.0223523534. The cubic root of 180644 is about 56.5294179431.

The spelling of 180644 in words is "one hundred eighty thousand, six hundred forty-four".