164722 has 4 divisors (see below), whose sum is σ = 247086. Its totient is φ = 82360.

The previous prime is 164707. The next prime is 164729. The reversal of 164722 is 227461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 227461 = 13 ⋅17497.

It can be written as a sum of positive squares in only one way, i.e., 136161 + 28561 = 369^2 + 169^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a d-powerful number, because it can be written as 1 + 6⁶ + 7⁶ + 4⁴ + 2⁵ + 2⁷ .

It is a junction number, because it is equal to n+sod(n) for n = 164693 and 164702.

It is not an unprimeable number, because it can be changed into a prime (164729) by changing a digit.

164722 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 as a sum of consecutive naturals, namely, 41179 + ... + 41182.

2¹⁶⁴⁷²² is an apocalyptic number.

164722 is a deficient number, since it is larger than the sum of its proper divisors (82364).

164722 is an equidigital number, since it uses as much as digits as its factorization.

164722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82363.

The product of its digits is 672, while the sum is 22.

The square root of 164722 is about 405.8595816289. The cubic root of 164722 is about 54.8172446483.

The spelling of 164722 in words is "one hundred sixty-four thousand, seven hundred twenty-two".