666927648 has 192 divisors, whose sum is σ = 2029587840. Its totient is φ = 212889600.

The previous prime is 666927643. The next prime is 666927649. The reversal of 666927648 is 846729666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 666927594 and 666927603.

It is not an unprimeable number, because it can be changed into a prime (666927643) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2373268 + ... + 2373548.

It is an arithmetic number, because the mean of its divisors is an integer number (10570770).

Almost surely, 2^666927648 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 666927648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1014793920).

666927648 is an abundant number, since it is smaller than the sum of its proper divisors (1362660192).

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

666927648 is a wasteful number, since it uses less digits than its factorization.

666927648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 394 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 54.

The square root of 666927648 is about 25824.9423619880. The cubic root of 666927648 is about 873.6944439616.

The spelling of 666927648 in words is "six hundred sixty-six million, nine hundred twenty-seven thousand, six hundred forty-eight".