660726 has 48 divisors (see below), whose sum is σ = 1617408. Its totient is φ = 193200.

The previous prime is 660719. The next prime is 660727. The reversal of 660726 is 627066.

660726 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

660726 is a modest number, since divided by 726 gives 66 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 660726.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660727) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9271 + ... + 9341.

It is an arithmetic number, because the mean of its divisors is an integer number (33696).

2⁶⁶⁰⁷²⁶ is an apocalyptic number.

660726 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 660726, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (808704).

660726 is an abundant number, since it is smaller than the sum of its proper divisors (956682).

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

660726 is a wasteful number, since it uses less digits than its factorization.

660726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 27.

The square root of 660726 is about 812.8505397673. The cubic root of 660726 is about 87.0977893682.

The spelling of 660726 in words is "six hundred sixty thousand, seven hundred twenty-six".