667898712 has 96 divisors (see below), whose sum is σ = 1955051280. Its totient is φ = 204768000.

The previous prime is 667898687. The next prime is 667898731. The reversal of 667898712 is 217898766.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 295587 + ... + 297837.

Almost surely, 2^667898712 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 667898712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (977525640).

667898712 is an abundant number, since it is smaller than the sum of its proper divisors (1287152568).

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

667898712 is a wasteful number, since it uses less digits than its factorization.

667898712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2593 (or 2586 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 667898712 is about 25843.7364171669. The cubic root of 667898712 is about 874.1182789339.

Adding to 667898712 its sum of digits (54), we get a palindrome (667898766).

The spelling of 667898712 in words is "six hundred sixty-seven million, eight hundred ninety-eight thousand, seven hundred twelve".