641718 has 48 divisors (see below), whose sum is σ = 1737216. Its totient is φ = 166320.

The previous prime is 641713. The next prime is 641747. The reversal of 641718 is 817146.

It is a happy number.

641718 is a `hidden beast` number, since 641 + 7 + 18 = 666.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 641691 and 641700.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 641718.

It is not an unprimeable number, because it can be changed into a prime (641713) by changing a digit.

641718 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1155 + ... + 1617.

It is an arithmetic number, because the mean of its divisors is an integer number (36192).

2⁶⁴¹⁷¹⁸ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641718, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (868608).

641718 is an abundant number, since it is smaller than the sum of its proper divisors (1095498).

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

641718 is a wasteful number, since it uses less digits than its factorization.

641718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 486 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 641718 is about 801.0730303786. The cubic root of 641718 is about 86.2544295142.

The spelling of 641718 in words is "six hundred forty-one thousand, seven hundred eighteen".