642216 has 16 divisors (see below), whose sum is σ = 1605600. Its totient is φ = 214064.

The previous prime is 642211. The next prime is 642217. The reversal of 642216 is 612246.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 642192 and 642201.

It is not an unprimeable number, because it can be changed into a prime (642211) by changing a digit.

642216 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, 13356 + ... + 13403.

It is an arithmetic number, because the mean of its divisors is an integer number (100350).

2⁶⁴²²¹⁶ is an apocalyptic number.

It is an amenable number.

642216 is an abundant number, since it is smaller than the sum of its proper divisors (963384).

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

642216 is a wasteful number, since it uses less digits than its factorization.

642216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26768 (or 26764 counting only the distinct ones).

The product of its digits is 576, while the sum is 21.

The square root of 642216 is about 801.3838031805. The cubic root of 642216 is about 86.2767360928.

It can be divided in two parts, 642 and 216, that added together give a palindrome (858).

The spelling of 642216 in words is "six hundred forty-two thousand, two hundred sixteen".