621228 has 12 divisors (see below), whose sum is σ = 1449560. Its totient is φ = 207072.

The previous prime is 621227. The next prime is 621239. The reversal of 621228 is 822126.

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

It is not an unprimeable number, because it can be changed into a prime (621223) 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 in 3 ways as a sum of consecutive naturals, for example, 25873 + ... + 25896.

2⁶²¹²²⁸ is an apocalyptic number.

It is an amenable number.

621228 is an abundant number, since it is smaller than the sum of its proper divisors (828332).

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

621228 is a wasteful number, since it uses less digits than its factorization.

621228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51776 (or 51774 counting only the distinct ones).

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

The square root of 621228 is about 788.1801824456. The cubic root of 621228 is about 85.3264493687.

The spelling of 621228 in words is "six hundred twenty-one thousand, two hundred twenty-eight".