666724630 has 128 divisors (see below), whose sum is σ = 1515386880. Its totient is φ = 207567360.

The previous prime is 666724627. The next prime is 666724637. The reversal of 666724630 is 36427666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666724637) 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 63 ways as a sum of consecutive naturals, for example, 1439779 + ... + 1440241.

It is an arithmetic number, because the mean of its divisors is an integer number (11838960).

Almost surely, 2^666724630 is an apocalyptic number.

666724630 is an abundant number, since it is smaller than the sum of its proper divisors (848662250).

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

666724630 is a wasteful number, since it uses less digits than its factorization.

666724630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566.

The product of its (nonzero) digits is 217728, while the sum is 40.

The square root of 666724630 is about 25821.0114054427. The cubic root of 666724630 is about 873.6057818204.

The spelling of 666724630 in words is "six hundred sixty-six million, seven hundred twenty-four thousand, six hundred thirty".