645180 has 24 divisors (see below), whose sum is σ = 1806672. Its totient is φ = 172032.

The previous prime is 645179. The next prime is 645187. The reversal of 645180 is 81546.

645180 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 645180.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645187) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5317 + ... + 5436.

It is an arithmetic number, because the mean of its divisors is an integer number (75278).

2⁶⁴⁵¹⁸⁰ is an apocalyptic number.

645180 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645180 is an abundant number, since it is smaller than the sum of its proper divisors (1161492).

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

645180 is a wasteful number, since it uses less digits than its factorization.

645180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10765 (or 10763 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 645180 is about 803.2309754983. The cubic root of 645180 is about 86.4092625529.

The spelling of 645180 in words is "six hundred forty-five thousand, one hundred eighty".