666874340 has 24 divisors (see below), whose sum is σ = 1527748992. Its totient is φ = 242499680.

The previous prime is 666874309. The next prime is 666874367. The reversal of 666874340 is 43478666.

It is a happy number.

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 = 666874291 and 666874300.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1515404 + ... + 1515843.

It is an arithmetic number, because the mean of its divisors is an integer number (63656208).

Almost surely, 2^666874340 is an apocalyptic number.

It is an amenable number.

666874340 is an abundant number, since it is smaller than the sum of its proper divisors (860874652).

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

666874340 is a wasteful number, since it uses less digits than its factorization.

666874340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3031267 (or 3031265 counting only the distinct ones).

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

The square root of 666874340 is about 25823.9102383818. The cubic root of 666874340 is about 873.6711650025.

The spelling of 666874340 in words is "six hundred sixty-six million, eight hundred seventy-four thousand, three hundred forty".