669847256 has 32 divisors (see below), whose sum is σ = 1396214400. Its totient is φ = 299185920.

The previous prime is 669847229. The next prime is 669847259. The reversal of 669847256 is 652748966.

It is a junction number, because it is equal to n+sod(n) for n = 669847198 and 669847207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669847259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100661 + ... + 107108.

It is an arithmetic number, because the mean of its divisors is an integer number (43631700).

Almost surely, 2^669847256 is an apocalyptic number.

It is an amenable number.

669847256 is an abundant number, since it is smaller than the sum of its proper divisors (726367144).

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

669847256 is a wasteful number, since it uses less digits than its factorization.

669847256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207819 (or 207815 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 53.

The square root of 669847256 is about 25881.4075351400. The cubic root of 669847256 is about 874.9675116101.

The spelling of 669847256 in words is "six hundred sixty-nine million, eight hundred forty-seven thousand, two hundred fifty-six".