646180 has 12 divisors (see below), whose sum is σ = 1357020. Its totient is φ = 258464.

The previous prime is 646169. The next prime is 646181. The reversal of 646180 is 81646.

It can be written as a sum of positive squares in 2 ways, for example, as 438244 + 207936 = 662^2 + 456^2 .

It is not an unprimeable number, because it can be changed into a prime (646181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16135 + ... + 16174.

It is an arithmetic number, because the mean of its divisors is an integer number (113085).

2⁶⁴⁶¹⁸⁰ is an apocalyptic number.

It is an amenable number.

646180 is an abundant number, since it is smaller than the sum of its proper divisors (710840).

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

646180 is a wasteful number, since it uses less digits than its factorization.

646180 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32318 (or 32316 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 646180 is about 803.8532204327. The cubic root of 646180 is about 86.4538829986.

The spelling of 646180 in words is "six hundred forty-six thousand, one hundred eighty".