666438324 has 24 divisors (see below), whose sum is σ = 1584364320. Its totient is φ = 217954464.

The previous prime is 666438323. The next prime is 666438343. The reversal of 666438324 is 423834666.

It is a happy number.

666438324 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-4 number, since 4×666438324⁴ (a number of 36 digits) contains 4444 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666438323) 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, 523294 + ... + 524565.

It is an arithmetic number, because the mean of its divisors is an integer number (66015180).

Almost surely, 2^666438324 is an apocalyptic number.

It is an amenable number.

666438324 is an abundant number, since it is smaller than the sum of its proper divisors (917925996).

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

666438324 is a wasteful number, since it uses less digits than its factorization.

666438324 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1047919 (or 1047917 counting only the distinct ones).

The product of its digits is 497664, while the sum is 42.

The square root of 666438324 is about 25815.4667592899. The cubic root of 666438324 is about 873.4807155005.

The spelling of 666438324 in words is "six hundred sixty-six million, four hundred thirty-eight thousand, three hundred twenty-four".