657222 has 8 divisors (see below), whose sum is σ = 1314456. Its totient is φ = 219072.

The previous prime is 657197. The next prime is 657233. The reversal of 657222 is 222756.

657222 is nontrivially palindromic in base 15.

It is a sphenic number, since it is the product of 3 distinct primes.

657222 is an admirable number.

It is a d-powerful number, because it can be written as 6⁴ + 5 + 2⁹ + 7² + 2¹⁷ + 2¹⁹ .

It is a junction number, because it is equal to n+sod(n) for n = 657192 and 657201.

It is a congruent number.

It is an unprimeable number.

657222 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, 54763 + ... + 54774.

It is an arithmetic number, because the mean of its divisors is an integer number (164307).

2⁶⁵⁷²²² is an apocalyptic number.

657222 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.

657222 is a wasteful number, since it uses less digits than its factorization.

657222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109542.

The product of its digits is 1680, while the sum is 24.

The square root of 657222 is about 810.6922967440. The cubic root of 657222 is about 86.9435490575.

Adding to 657222 its reverse (222756), we get a palindrome (879978).

The spelling of 657222 in words is "six hundred fifty-seven thousand, two hundred twenty-two".