671736320 has 80 divisors (see below), whose sum is σ = 1618443288. Its totient is φ = 267386880.

The previous prime is 671736319. The next prime is 671736379. The reversal of 671736320 is 23637176.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 666052864 + 5683456 = 25808^2 + 2384^2 .

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 7 ways as a sum of consecutive naturals, for example, 657410 + ... + 658430.

Almost surely, 2^671736320 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 671736320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (809221644).

671736320 is an abundant number, since it is smaller than the sum of its proper divisors (946706968).

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

671736320 is a wasteful number, since it uses less digits than its factorization.

671736320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301 (or 1285 counting only the distinct ones).

The product of its (nonzero) digits is 31752, while the sum is 35.

The square root of 671736320 is about 25917.8764562223. The cubic root of 671736320 is about 875.7892503308.

The spelling of 671736320 in words is "six hundred seventy-one million, seven hundred thirty-six thousand, three hundred twenty".