666528 has 48 divisors (see below), whose sum is σ = 1796256. Its totient is φ = 216320.

The previous prime is 666527. The next prime is 666529. The reversal of 666528 is 825666.

It is an interprime number because it is at equal distance from previous prime (666527) and next prime (666529).

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5023 + ... + 5153.

It is an arithmetic number, because the mean of its divisors is an integer number (37422).

2⁶⁶⁶⁵²⁸ 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 666528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (898128).

666528 is an abundant number, since it is smaller than the sum of its proper divisors (1129728).

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

666528 is a wasteful number, since it uses less digits than its factorization.

666528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197 (or 189 counting only the distinct ones).

The product of its digits is 17280, while the sum is 33.

The square root of 666528 is about 816.4116608672. The cubic root of 666528 is about 87.3519892291.

The spelling of 666528 in words is "six hundred sixty-six thousand, five hundred twenty-eight".