669216 has 24 divisors (see below), whose sum is σ = 1756944. Its totient is φ = 223040.

The previous prime is 669181. The next prime is 669241. The reversal of 669216 is 612966.

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 3390 + ... + 3581.

It is an arithmetic number, because the mean of its divisors is an integer number (73206).

2⁶⁶⁹²¹⁶ is an apocalyptic number.

It is an amenable number.

669216 is an abundant number, since it is smaller than the sum of its proper divisors (1087728).

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

669216 is a wasteful number, since it uses less digits than its factorization.

669216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6984 (or 6976 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 669216 is about 818.0562327860. The cubic root of 669216 is about 87.4692572271.

The spelling of 669216 in words is "six hundred sixty-nine thousand, two hundred sixteen".