669538 has 8 divisors (see below), whose sum is σ = 1036800. Its totient is φ = 323940.

The previous prime is 669527. The next prime is 669551. The reversal of 669538 is 835966.

669538 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×669538² = 896562266888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 669497 and 669506.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5338 + ... + 5461.

It is an arithmetic number, because the mean of its divisors is an integer number (129600).

2⁶⁶⁹⁵³⁸ is an apocalyptic number.

669538 is a deficient number, since it is larger than the sum of its proper divisors (367262).

669538 is a wasteful number, since it uses less digits than its factorization.

669538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10832.

The product of its digits is 38880, while the sum is 37.

The square root of 669538 is about 818.2530171041. The cubic root of 669538 is about 87.4832838816.

It can be divided in two parts, 66 and 9538, that added together give a square (9604 = 98²).

The spelling of 669538 in words is "six hundred sixty-nine thousand, five hundred thirty-eight".