669069 has 12 divisors (see below), whose sum is σ = 1023516. Its totient is φ = 419712.

The previous prime is 669049. The next prime is 669077. The reversal of 669069 is 960966.

669069 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 455625 + 213444 = 675^2 + 462^2 .

It is not a de Polignac number, because 669069 - 2⁸ = 668813 is a prime.

It is a super-2 number, since 2×669069² = 895306653522, which contains 22 as substring.

669069 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2034 + ... + 2339.

It is an arithmetic number, because the mean of its divisors is an integer number (85293).

2⁶⁶⁹⁰⁶⁹ is an apocalyptic number.

It is an amenable number.

669069 is a deficient number, since it is larger than the sum of its proper divisors (354447).

669069 is a wasteful number, since it uses less digits than its factorization.

669069 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4396 (or 4393 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 669069 is about 817.9663807272. The cubic root of 669069 is about 87.4628522585.

It can be divided in two parts, 6 and 69069, that multiplied together give a palindrome (414414).

The spelling of 669069 in words is "six hundred sixty-nine thousand, sixty-nine".