671560648 has 48 divisors (see below), whose sum is σ = 1417894380. Its totient is φ = 297792000.

The previous prime is 671560621. The next prime is 671560667. The reversal of 671560648 is 846065176.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 652393764 + 19166884 = 25542^2 + 4378^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31228 + ... + 48148.

Almost surely, 2^671560648 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 671560648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (708947190).

671560648 is an abundant number, since it is smaller than the sum of its proper divisors (746333732).

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

671560648 is a wasteful number, since it uses less digits than its factorization.

671560648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16990 (or 16975 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 671560648 is about 25914.4872224013. The cubic root of 671560648 is about 875.7128984160.

The spelling of 671560648 in words is "six hundred seventy-one million, five hundred sixty thousand, six hundred forty-eight".