660775752 has 128 divisors (see below), whose sum is σ = 2259129600. Its totient is φ = 174265344.

The previous prime is 660775681. The next prime is 660775781. The reversal of 660775752 is 257577066.

660775752 is a `hidden beast` number, since 6 + 6 + 0 + 77 + 575 + 2 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 660775698 and 660775707.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2848 + ... + 36464.

It is an arithmetic number, because the mean of its divisors is an integer number (17649450).

Almost surely, 2^660775752 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 660775752, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1129564800).

660775752 is an abundant number, since it is smaller than the sum of its proper divisors (1598353848).

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

660775752 is a wasteful number, since it uses less digits than its factorization.

660775752 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33652 (or 33642 counting only the distinct ones).

The product of its (nonzero) digits is 617400, while the sum is 45.

The square root of 660775752 is about 25705.5587762647. The cubic root of 660775752 is about 870.9997543853. Note that the first 3 decimals are identical.

The spelling of 660775752 in words is "six hundred sixty million, seven hundred seventy-five thousand, seven hundred fifty-two".