671540112 has 80 divisors (see below), whose sum is σ = 1946780160. Its totient is φ = 221616000.

The previous prime is 671540041. The next prime is 671540113. The reversal of 671540112 is 211045176.

It is a happy number.

671540112 is a `hidden beast` number, since 6 + 7 + 1 + 540 + 112 = 666.

It is a super-2 number, since 2×671540112² = 901932244049945088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (671540113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35937 + ... + 51327.

It is an arithmetic number, because the mean of its divisors is an integer number (24334752).

Almost surely, 2^671540112 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 671540112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (973390080).

671540112 is an abundant number, since it is smaller than the sum of its proper divisors (1275240048).

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

671540112 is a wasteful number, since it uses less digits than its factorization.

671540112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15509 (or 15497 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

The square root of 671540112 is about 25914.0909931257. The cubic root of 671540112 is about 875.7039720327.

Adding to 671540112 its reverse (211045176), we get a palindrome (882585288).

The spelling of 671540112 in words is "six hundred seventy-one million, five hundred forty thousand, one hundred twelve".