641536 has 40 divisors (see below), whose sum is σ = 1473120. Its totient is φ = 273408.

The previous prime is 641521. The next prime is 641549. The reversal of 641536 is 635146.

It is a self number, because there is not a number n which added to its sum of digits gives 641536.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3495 + ... + 3673.

It is an arithmetic number, because the mean of its divisors is an integer number (36828).

2⁶⁴¹⁵³⁶ 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 641536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (736560).

641536 is an abundant number, since it is smaller than the sum of its proper divisors (831584).

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

641536 is an equidigital number, since it uses as much as digits as its factorization.

641536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 204 (or 188 counting only the distinct ones).

The product of its digits is 2160, while the sum is 25.

The square root of 641536 is about 800.9594246902. The cubic root of 641536 is about 86.2462744312.

It can be divided in two parts, 64 and 1536, that added together give a square (1600 = 40²).

The spelling of 641536 in words is "six hundred forty-one thousand, five hundred thirty-six".