641228 has 12 divisors (see below), whose sum is σ = 1282512. Its totient is φ = 274800.

The previous prime is 641227. The next prime is 641239. The reversal of 641228 is 822146.

641228 is an admirable number.

It is a super-2 number, since 2×641228² = 822346695968, which contains 22 as substring.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (641227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11423 + ... + 11478.

It is an arithmetic number, because the mean of its divisors is an integer number (106876).

2⁶⁴¹²²⁸ is an apocalyptic number.

It is an amenable number.

641228 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

641228 is a wasteful number, since it uses less digits than its factorization.

641228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22912 (or 22910 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 641228 is about 800.7671321926. The cubic root of 641228 is about 86.2324700073.

The spelling of 641228 in words is "six hundred forty-one thousand, two hundred twenty-eight".