688222 has 4 divisors (see below), whose sum is σ = 1032336. Its totient is φ = 344110.

The previous prime is 688217. The next prime is 688223. The reversal of 688222 is 222886.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 222886 = 2 ⋅111443.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172054 + ... + 172057.

It is an arithmetic number, because the mean of its divisors is an integer number (258084).

2⁶⁸⁸²²² is an apocalyptic number.

688222 is a deficient number, since it is larger than the sum of its proper divisors (344114).

688222 is a wasteful number, since it uses less digits than its factorization.

688222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344113.

The product of its digits is 3072, while the sum is 28.

The square root of 688222 is about 829.5914657227. The cubic root of 688222 is about 88.2895934710.

The spelling of 688222 in words is "six hundred eighty-eight thousand, two hundred twenty-two".