641760 has 96 divisors (see below), whose sum is σ = 2322432. Its totient is φ = 145920.

The previous prime is 641749. The next prime is 641761. The reversal of 641760 is 67146.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 641760.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641761) by changing a digit.

641760 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, 3265 + ... + 3455.

It is an arithmetic number, because the mean of its divisors is an integer number (24192).

2⁶⁴¹⁷⁶⁰ is an apocalyptic number.

641760 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 641760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1161216).

641760 is an abundant number, since it is smaller than the sum of its proper divisors (1680672).

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

641760 is a wasteful number, since it uses less digits than its factorization.

641760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 24.

The square root of 641760 is about 801.0992447881. The cubic root of 641760 is about 86.2563112374.

The spelling of 641760 in words is "six hundred forty-one thousand, seven hundred sixty".