671386650 has 144 divisors (see below), whose sum is σ = 1859505984. Its totient is φ = 160160000.

The previous prime is 671386633. The next prime is 671386657. The reversal of 671386650 is 56683176.

It is not an unprimeable number, because it can be changed into a prime (671386657) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1288390 + ... + 1288910.

It is an arithmetic number, because the mean of its divisors is an integer number (12913236).

Almost surely, 2^671386650 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671386650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (929752992).

671386650 is an abundant number, since it is smaller than the sum of its proper divisors (1188119334).

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

671386650 is a wasteful number, since it uses less digits than its factorization.

671386650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629 (or 613 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The square root of 671386650 is about 25911.1298480016. The cubic root of 671386650 is about 875.6372609414.

The spelling of 671386650 in words is "six hundred seventy-one million, three hundred eighty-six thousand, six hundred fifty".