669727 has 4 divisors (see below), whose sum is σ = 677880. Its totient is φ = 661576.

The previous prime is 669707. The next prime is 669733. The reversal of 669727 is 727966.

669727 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-669727 is a prime.

It is a Duffinian number.

669727 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669707) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3952 + ... + 4117.

It is an arithmetic number, because the mean of its divisors is an integer number (169470).

2⁶⁶⁹⁷²⁷ is an apocalyptic number.

669727 is a deficient number, since it is larger than the sum of its proper divisors (8153).

669727 is an equidigital number, since it uses as much as digits as its factorization.

669727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8152.

The product of its digits is 31752, while the sum is 37.

The square root of 669727 is about 818.3684989050. The cubic root of 669727 is about 87.4915148234.

It can be divided in two parts, 6697 and 27, that added together give a square (6724 = 82²).

The spelling of 669727 in words is "six hundred sixty-nine thousand, seven hundred twenty-seven".