669630172 has 12 divisors (see below), whose sum is σ = 1172054520. Its totient is φ = 334757456.

The previous prime is 669630151. The next prime is 669630173. The reversal of 669630172 is 271036966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669630173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21903 + ... + 42649.

It is an arithmetic number, because the mean of its divisors is an integer number (97671210).

Almost surely, 2^669630172 is an apocalyptic number.

It is an amenable number.

669630172 is a deficient number, since it is larger than the sum of its proper divisors (502424348).

669630172 is a wasteful number, since it uses less digits than its factorization.

669630172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28820 (or 28818 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 40.

The square root of 669630172 is about 25877.2133739319. The cubic root of 669630172 is about 874.8729816168.

The spelling of 669630172 in words is "six hundred sixty-nine million, six hundred thirty thousand, one hundred seventy-two".