671185920 has 176 divisors, whose sum is σ = 2206633248. Its totient is φ = 173998080.

The previous prime is 671185913. The next prime is 671185937. The reversal of 671185920 is 29581176.

It is a zygodrome in base 4.

It is a congruent number.

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, 567730 + ... + 568910.

Almost surely, 2^671185920 is an apocalyptic number.

671185920 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 671185920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1103316624).

671185920 is an abundant number, since it is smaller than the sum of its proper divisors (1535447328).

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

671185920 is a wasteful number, since it uses less digits than its factorization.

671185920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1246 (or 1228 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 39.

The square root of 671185920 is about 25907.2561264214. The cubic root of 671185920 is about 875.5499867470.

The spelling of 671185920 in words is "six hundred seventy-one million, one hundred eighty-five thousand, nine hundred twenty".