643080 has 64 divisors (see below), whose sum is σ = 2021760. Its totient is φ = 163328.

The previous prime is 643073. The next prime is 643081. The reversal of 643080 is 80346.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (643081) by changing a digit.

643080 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2644 + ... + 2876.

It is an arithmetic number, because the mean of its divisors is an integer number (31590).

2⁶⁴³⁰⁸⁰ is an apocalyptic number.

643080 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 643080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1010880).

643080 is an abundant number, since it is smaller than the sum of its proper divisors (1378680).

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

643080 is a wasteful number, since it uses less digits than its factorization.

643080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270 (or 266 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

The square root of 643080 is about 801.9226895406. The cubic root of 643080 is about 86.3154093203.

The spelling of 643080 in words is "six hundred forty-three thousand, eighty".