666727320 has 192 divisors, whose sum is σ = 2345436000. Its totient is φ = 151173120.

The previous prime is 666727319. The next prime is 666727337. The reversal of 666727320 is 23727666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 875740 + ... + 876500.

Almost surely, 2^666727320 is an apocalyptic number.

666727320 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666727320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1172718000).

666727320 is an abundant number, since it is smaller than the sum of its proper divisors (1678708680).

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

666727320 is a wasteful number, since it uses less digits than its factorization.

666727320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938 (or 927 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 39.

The square root of 666727320 is about 25821.0634947517. The cubic root of 666727320 is about 873.6069567165.

The spelling of 666727320 in words is "six hundred sixty-six million, seven hundred twenty-seven thousand, three hundred twenty".