666528432 has 80 divisors (see below), whose sum is σ = 1765125120. Its totient is φ = 216631296.

The previous prime is 666528403. The next prime is 666528437. The reversal of 666528432 is 234825666.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (666528437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 990048 + ... + 990720.

It is an arithmetic number, because the mean of its divisors is an integer number (22064064).

Almost surely, 2^666528432 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 666528432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (882562560).

666528432 is an abundant number, since it is smaller than the sum of its proper divisors (1098596688).

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

666528432 is a wasteful number, since it uses less digits than its factorization.

666528432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170 (or 1164 counting only the distinct ones).

The product of its digits is 414720, while the sum is 42.

The square root of 666528432 is about 25817.2119331271. The cubic root of 666528432 is about 873.5200810104.

The spelling of 666528432 in words is "six hundred sixty-six million, five hundred twenty-eight thousand, four hundred thirty-two".