671361720 has 128 divisors (see below), whose sum is σ = 2110717440. Its totient is φ = 170508800.

The previous prime is 671361683. The next prime is 671361731. The reversal of 671361720 is 27163176.

It is a congruent number.

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, 957370 + ... + 958070.

It is an arithmetic number, because the mean of its divisors is an integer number (16489980).

Almost surely, 2^671361720 is an apocalyptic number.

671361720 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 671361720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1055358720).

671361720 is an abundant number, since it is smaller than the sum of its proper divisors (1439355720).

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

671361720 is a wasteful number, since it uses less digits than its factorization.

671361720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1085 (or 1081 counting only the distinct ones).

The product of its (nonzero) digits is 10584, while the sum is 33.

The square root of 671361720 is about 25910.6487761306. The cubic root of 671361720 is about 875.6264227222.

The spelling of 671361720 in words is "six hundred seventy-one million, three hundred sixty-one thousand, seven hundred twenty".