666832320 has 672 divisors, whose sum is σ = 2982260736. Its totient is φ = 132710400.

The previous prime is 666832301. The next prime is 666832343. The reversal of 666832320 is 23238666.

It is a tau number, because it is divible by the number of its divisors (672).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6874512 + ... + 6874608.

It is an arithmetic number, because the mean of its divisors is an integer number (4437888).

Almost surely, 2^666832320 is an apocalyptic number.

666832320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666832320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1491130368).

666832320 is an abundant number, since it is smaller than the sum of its proper divisors (2315428416).

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

666832320 is a wasteful number, since it uses less digits than its factorization.

666832320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 666832320 is about 25823.0966384746. The cubic root of 666832320 is about 873.6528145021.

It can be divided in two parts, 66 and 6832320, that added together give a palindrome (6832386).

The spelling of 666832320 in words is "six hundred sixty-six million, eight hundred thirty-two thousand, three hundred twenty".