667241728 has 36 divisors (see below), whose sum is σ = 1344379680. Its totient is φ = 330489344.

The previous prime is 667241717. The next prime is 667241747. The reversal of 667241728 is 827142766.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15213 + ... + 39571.

It is an arithmetic number, because the mean of its divisors is an integer number (37343880).

Almost surely, 2^667241728 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 667241728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (672189840).

667241728 is an abundant number, since it is smaller than the sum of its proper divisors (677137952).

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

667241728 is a wasteful number, since it uses less digits than its factorization.

667241728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24482 (or 24468 counting only the distinct ones).

The product of its digits is 225792, while the sum is 43.

The square root of 667241728 is about 25831.0225891272. The cubic root of 667241728 is about 873.8315737220.

It can be divided in two parts, 6672 and 41728, that added together give a square (48400 = 220²).

The spelling of 667241728 in words is "six hundred sixty-seven million, two hundred forty-one thousand, seven hundred twenty-eight".