669821852 has 12 divisors (see below), whose sum is σ = 1339643760. Its totient is φ = 287066496.

The previous prime is 669821843. The next prime is 669821857. The reversal of 669821852 is 258128966.

669821852 is an admirable number.

It is a super-2 number, since 2×669821852² = 897322626833419808, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 669821797 and 669821806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669821857) 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, 11961077 + ... + 11961132.

It is an arithmetic number, because the mean of its divisors is an integer number (111636980).

Almost surely, 2^669821852 is an apocalyptic number.

It is an amenable number.

669821852 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

669821852 is a wasteful number, since it uses less digits than its factorization.

669821852 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23922220 (or 23922218 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The square root of 669821852 is about 25880.9167534691. The cubic root of 669821852 is about 874.9564504040.

The spelling of 669821852 in words is "six hundred sixty-nine million, eight hundred twenty-one thousand, eight hundred fifty-two".