641608 has 32 divisors (see below), whose sum is σ = 1373760. Its totient is φ = 278080.

The previous prime is 641581. The next prime is 641623. The reversal of 641608 is 806146.

It is an Ulam number.

It is an unprimeable number.

641608 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 7 ways as a sum of consecutive naturals, for example, 1866 + ... + 2182.

It is an arithmetic number, because the mean of its divisors is an integer number (42930).

2⁶⁴¹⁶⁰⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (686880).

641608 is an abundant number, since it is smaller than the sum of its proper divisors (732152).

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

641608 is a wasteful number, since it uses less digits than its factorization.

641608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 357 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 641608 is about 801.0043695262. The cubic root of 641608 is about 86.2495008023.

It can be divided in two parts, 6 and 41608, that added together give a palindrome (41614).

The spelling of 641608 in words is "six hundred forty-one thousand, six hundred eight".