671000720 has 80 divisors (see below), whose sum is σ = 1701557760. Its totient is φ = 244588032.

The previous prime is 671000719. The next prime is 671000777. The reversal of 671000720 is 27000176.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78077 + ... + 86243.

It is an arithmetic number, because the mean of its divisors is an integer number (21269472).

Almost surely, 2^671000720 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 671000720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (850778880).

671000720 is an abundant number, since it is smaller than the sum of its proper divisors (1030557040).

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

671000720 is a wasteful number, since it uses less digits than its factorization.

671000720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8272 (or 8266 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 23.

The square root of 671000720 is about 25903.6815916194. The cubic root of 671000720 is about 875.4694493136.

Adding to 671000720 its reverse (27000176), we get a palindrome (698000896).

The spelling of 671000720 in words is "six hundred seventy-one million, seven hundred twenty", and thus it is an aban number.