671740056 has 96 divisors (see below), whose sum is σ = 1969727760. Its totient is φ = 205583616.

The previous prime is 671740039. The next prime is 671740061. The reversal of 671740056 is 650047176.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 671740056.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 182571 + ... + 186213.

Almost surely, 2^671740056 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 671740056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (984863880).

671740056 is an abundant number, since it is smaller than the sum of its proper divisors (1297987704).

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

671740056 is a wasteful number, since it uses less digits than its factorization.

671740056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3865 (or 3858 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 671740056 is about 25917.9485299281. The cubic root of 671740056 is about 875.7908739553.

The spelling of 671740056 in words is "six hundred seventy-one million, seven hundred forty thousand, fifty-six".