641128 has 8 divisors (see below), whose sum is σ = 1202130. Its totient is φ = 320560.

The previous prime is 641101. The next prime is 641129. The reversal of 641128 is 821146.

It can be written as a sum of positive squares in only one way, i.e., 574564 + 66564 = 758^2 + 258^2 .

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

It is a super-2 number, since 2×641128² = 822090224768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 641099 and 641108.

It is not an unprimeable number, because it can be changed into a prime (641129) by changing a digit.

641128 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 as a sum of consecutive naturals, namely, 40063 + ... + 40078.

2⁶⁴¹¹²⁸ is an apocalyptic number.

It is an amenable number.

641128 is a deficient number, since it is larger than the sum of its proper divisors (561002).

641128 is a wasteful number, since it uses less digits than its factorization.

641128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80147 (or 80143 counting only the distinct ones).

The product of its digits is 384, while the sum is 22.

The square root of 641128 is about 800.7046896328. The cubic root of 641128 is about 86.2279871009.

The spelling of 641128 in words is "six hundred forty-one thousand, one hundred twenty-eight".