641028 has 12 divisors (see below), whose sum is σ = 1495760. Its totient is φ = 213672.

The previous prime is 640993. The next prime is 641051. The reversal of 641028 is 820146.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 640995 and 641013.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 641028.

It is an unprimeable number.

641028 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 3 ways as a sum of consecutive naturals, for example, 26698 + ... + 26721.

2⁶⁴¹⁰²⁸ is an apocalyptic number.

It is an amenable number.

641028 is an abundant number, since it is smaller than the sum of its proper divisors (854732).

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

641028 is a wasteful number, since it uses less digits than its factorization.

641028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53426 (or 53424 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 641028 is about 800.6422422031. The cubic root of 641028 is about 86.2235037284.

The spelling of 641028 in words is "six hundred forty-one thousand, twenty-eight".