669312 has 96 divisors (see below), whose sum is σ = 2227680. Its totient is φ = 188928.

The previous prime is 669311. The next prime is 669329. The reversal of 669312 is 213966.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (669311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8023 + ... + 8105.

It is an arithmetic number, because the mean of its divisors is an integer number (23205).

2⁶⁶⁹³¹² is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1113840).

669312 is an abundant number, since it is smaller than the sum of its proper divisors (1558368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

669312 is a wasteful number, since it uses less digits than its factorization.

669312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 95 counting only the distinct ones).

The product of its digits is 1944, while the sum is 27.

The square root of 669312 is about 818.1149063548. The cubic root of 669312 is about 87.4734395575.

The spelling of 669312 in words is "six hundred sixty-nine thousand, three hundred twelve".