666478340 has 24 divisors (see below), whose sum is σ = 1526841792. Its totient is φ = 242355680.

The previous prime is 666478327. The next prime is 666478361. The reversal of 666478340 is 43874666.

It is a happy number.

666478340 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is a junction number, because it is equal to n+sod(n) for n = 666478291 and 666478300.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1514504 + ... + 1514943.

It is an arithmetic number, because the mean of its divisors is an integer number (63618408).

Almost surely, 2^666478340 is an apocalyptic number.

It is an amenable number.

666478340 is an abundant number, since it is smaller than the sum of its proper divisors (860363452).

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

666478340 is a wasteful number, since it uses less digits than its factorization.

666478340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3029467 (or 3029465 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 44.

The square root of 666478340 is about 25816.2417869062. The cubic root of 666478340 is about 873.4981977408.

The spelling of 666478340 in words is "six hundred sixty-six million, four hundred seventy-eight thousand, three hundred forty".