671239120 has 80 divisors (see below), whose sum is σ = 1595290752. Its totient is φ = 262586880.

The previous prime is 671239111. The next prime is 671239123. The reversal of 671239120 is 21932176.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (671239123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1283179 + ... + 1283701.

Almost surely, 2^671239120 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 671239120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (797645376).

671239120 is an abundant number, since it is smaller than the sum of its proper divisors (924051632).

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

671239120 is a wasteful number, since it uses less digits than its factorization.

671239120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 860 (or 854 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 671239120 is about 25908.2828454531. The cubic root of 671239120 is about 875.5731189509.

The spelling of 671239120 in words is "six hundred seventy-one million, two hundred thirty-nine thousand, one hundred twenty".