666887764 has 48 divisors (see below), whose sum is σ = 1325419200. Its totient is φ = 291672576.

The previous prime is 666887723. The next prime is 666887789. The reversal of 666887764 is 467788666.

It is a happy number.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 666887699 and 666887708.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 63607 + ... + 73345.

It is an arithmetic number, because the mean of its divisors is an integer number (27612900).

Almost surely, 2^666887764 is an apocalyptic number.

It is an amenable number.

666887764 is a deficient number, since it is larger than the sum of its proper divisors (658531436).

666887764 is a wasteful number, since it uses less digits than its factorization.

666887764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9832 (or 9830 counting only the distinct ones).

The product of its digits is 16257024, while the sum is 58.

The square root of 666887764 is about 25824.1701512362. The cubic root of 666887764 is about 873.6770272178.

The spelling of 666887764 in words is "six hundred sixty-six million, eight hundred eighty-seven thousand, seven hundred sixty-four".