671812144 has 40 divisors (see below), whose sum is σ = 1359689760. Its totient is φ = 321151488.

The previous prime is 671812133. The next prime is 671812151. The reversal of 671812144 is 441218176.

It is a happy number.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40764 + ... + 54820.

It is an arithmetic number, because the mean of its divisors is an integer number (33992244).

Almost surely, 2^671812144 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 671812144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (679844880).

671812144 is an abundant number, since it is smaller than the sum of its proper divisors (687877616).

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

671812144 is a wasteful number, since it uses less digits than its factorization.

671812144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14197 (or 14191 counting only the distinct ones).

The product of its digits is 10752, while the sum is 34.

The square root of 671812144 is about 25919.3391891074. The cubic root of 671812144 is about 875.8222014277.

The spelling of 671812144 in words is "six hundred seventy-one million, eight hundred twelve thousand, one hundred forty-four".