643380 has 24 divisors (see below), whose sum is σ = 1801632. Its totient is φ = 171552.

The previous prime is 643373. The next prime is 643403. The reversal of 643380 is 83346.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 643380.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5302 + ... + 5421.

It is an arithmetic number, because the mean of its divisors is an integer number (75068).

2⁶⁴³³⁸⁰ is an apocalyptic number.

643380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

643380 is an abundant number, since it is smaller than the sum of its proper divisors (1158252).

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

643380 is a wasteful number, since it uses less digits than its factorization.

643380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10735 (or 10733 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 643380 is about 802.1097181807. The cubic root of 643380 is about 86.3288294221.

The spelling of 643380 in words is "six hundred forty-three thousand, three hundred eighty".