666724608 has 360 divisors, whose sum is σ = 2255594880. Its totient is φ = 194088960.

The previous prime is 666724559. The next prime is 666724609. The reversal of 666724608 is 806427666.

It is not an unprimeable number, because it can be changed into a prime (666724609) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 8439513 + ... + 8439591.

Almost surely, 2^666724608 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666724608, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1127797440).

666724608 is an abundant number, since it is smaller than the sum of its proper divisors (1588870272).

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

666724608 is a wasteful number, since it uses less digits than its factorization.

666724608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 132 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The square root of 666724608 is about 25821.0109794330. The cubic root of 666724608 is about 873.6057722116.

The spelling of 666724608 in words is "six hundred sixty-six million, seven hundred twenty-four thousand, six hundred eight".