669628 has 6 divisors (see below), whose sum is σ = 1171856. Its totient is φ = 334812.

The previous prime is 669611. The next prime is 669637. The reversal of 669628 is 826966.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83700 + ... + 83707.

2⁶⁶⁹⁶²⁸ is an apocalyptic number.

It is an amenable number.

669628 is a deficient number, since it is larger than the sum of its proper divisors (502228).

669628 is a wasteful number, since it uses less digits than its factorization.

669628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167411 (or 167409 counting only the distinct ones).

The product of its digits is 31104, while the sum is 37.

The square root of 669628 is about 818.3080104704. The cubic root of 669628 is about 87.4872035709.

It can be divided in two parts, 6696 and 28, that added together give a square (6724 = 82²).

The spelling of 669628 in words is "six hundred sixty-nine thousand, six hundred twenty-eight".