629666856 has 144 divisors (see below), whose sum is σ = 2136525300. Its totient is φ = 166053888.

The previous prime is 629666809. The next prime is 629666887. The reversal of 629666856 is 658666926.

It can be written as a sum of positive squares in 2 ways, for example, as 587286756 + 42380100 = 24234^2 + 6510^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 39000 + ... + 52728.

Almost surely, 2^629666856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 629666856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1068262650).

629666856 is an abundant number, since it is smaller than the sum of its proper divisors (1506858444).

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

629666856 is a wasteful number, since it uses less digits than its factorization.

629666856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13768 (or 13754 counting only the distinct ones).

The product of its digits is 5598720, while the sum is 54.

The square root of 629666856 is about 25093.1635311294. The cubic root of 629666856 is about 857.1107548929.

The spelling of 629666856 in words is "six hundred twenty-nine million, six hundred sixty-six thousand, eight hundred fifty-six".