666320732 has 48 divisors (see below), whose sum is σ = 1455874560. Its totient is φ = 259233600.

The previous prime is 666320731. The next prime is 666320749. The reversal of 666320732 is 237023666.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 666320692 and 666320701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666320731) 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, 325769 + ... + 327807.

It is an arithmetic number, because the mean of its divisors is an integer number (30330720).

Almost surely, 2^666320732 is an apocalyptic number.

It is an amenable number.

666320732 is an abundant number, since it is smaller than the sum of its proper divisors (789553828).

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

666320732 is a wasteful number, since it uses less digits than its factorization.

666320732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3122 (or 3120 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 35.

The square root of 666320732 is about 25813.1891094456. The cubic root of 666320732 is about 873.4293377098.

The spelling of 666320732 in words is "six hundred sixty-six million, three hundred twenty thousand, seven hundred thirty-two".