669722 has 4 divisors (see below), whose sum is σ = 1004586. Its totient is φ = 334860.

The previous prime is 669707. The next prime is 669733. The reversal of 669722 is 227966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 227966 = 2 ⋅113983.

It can be written as a sum of positive squares in only one way, i.e., 579121 + 90601 = 761^2 + 301^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 167429 + ... + 167432.

2⁶⁶⁹⁷²² is an apocalyptic number.

669722 is a deficient number, since it is larger than the sum of its proper divisors (334864).

669722 is a wasteful number, since it uses less digits than its factorization.

669722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334863.

The product of its digits is 9072, while the sum is 32.

The square root of 669722 is about 818.3654440407. The cubic root of 669722 is about 87.4912970936.

The spelling of 669722 in words is "six hundred sixty-nine thousand, seven hundred twenty-two".