642228 has 24 divisors (see below), whose sum is σ = 1515360. Its totient is φ = 211680.

The previous prime is 642223. The next prime is 642233. The reversal of 642228 is 822246.

642228 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (642223) and next prime (642233).

It is a junction number, because it is equal to n+sod(n) for n = 642198 and 642207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1063 + ... + 1553.

It is an arithmetic number, because the mean of its divisors is an integer number (63140).

2⁶⁴²²²⁸ is an apocalyptic number.

It is an amenable number.

642228 is an abundant number, since it is smaller than the sum of its proper divisors (873132).

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

642228 is a wasteful number, since it uses less digits than its factorization.

642228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 607 (or 605 counting only the distinct ones).

The product of its digits is 1536, while the sum is 24.

The square root of 642228 is about 801.3912901947. The cubic root of 642228 is about 86.2772734584.

The spelling of 642228 in words is "six hundred forty-two thousand, two hundred twenty-eight".