666727990 has 16 divisors (see below), whose sum is σ = 1200458880. Its totient is φ = 266613760.

The previous prime is 666727949. The next prime is 666727991. The reversal of 666727990 is 99727666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666727991) by changing a digit.

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, 37371 + ... + 52249.

It is an arithmetic number, because the mean of its divisors is an integer number (75028680).

Almost surely, 2^666727990 is an apocalyptic number.

666727990 is a deficient number, since it is larger than the sum of its proper divisors (533730890).

666727990 is a wasteful number, since it uses less digits than its factorization.

666727990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19367.

The product of its (nonzero) digits is 1714608, while the sum is 52.

The square root of 666727990 is about 25821.0764686525. The cubic root of 666727990 is about 873.6072493481.

The spelling of 666727990 in words is "six hundred sixty-six million, seven hundred twenty-seven thousand, nine hundred ninety".