671680716 has 96 divisors (see below), whose sum is σ = 1871600640. Its totient is φ = 183423744.

The previous prime is 671680703. The next prime is 671680729. The reversal of 671680716 is 617086176.

It is an interprime number because it is at equal distance from previous prime (671680703) and next prime (671680729).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 249570 + ... + 252246.

It is an arithmetic number, because the mean of its divisors is an integer number (19495840).

Almost surely, 2^671680716 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 671680716, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (935800320).

671680716 is an abundant number, since it is smaller than the sum of its proper divisors (1199919924).

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

671680716 is a wasteful number, since it uses less digits than its factorization.

671680716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2823 (or 2821 counting only the distinct ones).

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 671680716 is about 25916.8037381155. The cubic root of 671680716 is about 875.7650847330.

The spelling of 671680716 in words is "six hundred seventy-one million, six hundred eighty thousand, seven hundred sixteen".