666704740 has 24 divisors (see below), whose sum is σ = 1507779000. Its totient is φ = 246167808.

The previous prime is 666704681. The next prime is 666704747. The reversal of 666704740 is 47407666.

It can be written as a sum of positive squares in 4 ways, for example, as 63904036 + 602800704 = 7994^2 + 24552^2 .

It is a junction number, because it is equal to n+sod(n) for n = 666704693 and 666704702.

It is not an unprimeable number, because it can be changed into a prime (666704747) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1281865 + ... + 1282384.

It is an arithmetic number, because the mean of its divisors is an integer number (62824125).

Almost surely, 2^666704740 is an apocalyptic number.

It is an amenable number.

666704740 is an abundant number, since it is smaller than the sum of its proper divisors (841074260).

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

666704740 is a wasteful number, since it uses less digits than its factorization.

666704740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2564271 (or 2564269 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 666704740 is about 25820.6262511195. The cubic root of 666704740 is about 873.5970944798.

The spelling of 666704740 in words is "six hundred sixty-six million, seven hundred four thousand, seven hundred forty".