641528 has 8 divisors (see below), whose sum is σ = 1202880. Its totient is φ = 320760.

The previous prime is 641521. The next prime is 641549. The reversal of 641528 is 825146.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 641497 and 641506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641521) by changing a digit.

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 as a sum of consecutive naturals, namely, 40088 + ... + 40103.

It is an arithmetic number, because the mean of its divisors is an integer number (150360).

2⁶⁴¹⁵²⁸ is an apocalyptic number.

It is an amenable number.

641528 is a deficient number, since it is larger than the sum of its proper divisors (561352).

641528 is a wasteful number, since it uses less digits than its factorization.

641528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80197 (or 80193 counting only the distinct ones).

The product of its digits is 1920, while the sum is 26.

The square root of 641528 is about 800.9544306638. The cubic root of 641528 is about 86.2459159307.

The spelling of 641528 in words is "six hundred forty-one thousand, five hundred twenty-eight".