669056 has 16 divisors (see below), whose sum is σ = 1333140. Its totient is φ = 334464.

The previous prime is 669049. The next prime is 669077. The reversal of 669056 is 650966.

It is a tau number, because it is divible by the number of its divisors (16).

It is a super-2 number, since 2×669056² = 895271862272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

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 as a sum of consecutive naturals, namely, 2486 + ... + 2741.

2⁶⁶⁹⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

669056 is a deficient number, since it is larger than the sum of its proper divisors (664084).

669056 is an equidigital number, since it uses as much as digits as its factorization.

669056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5241 (or 5229 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 32.

The square root of 669056 is about 817.9584341518. The cubic root of 669056 is about 87.4622857876.

The spelling of 669056 in words is "six hundred sixty-nine thousand, fifty-six".