766887664 has 20 divisors (see below), whose sum is σ = 1511030520. Its totient is φ = 376944320.

The previous prime is 766887659. The next prime is 766887683. The reversal of 766887664 is 466788667.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 766887599 and 766887608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405247 + ... + 407134.

It is an arithmetic number, because the mean of its divisors is an integer number (75551526).

Almost surely, 2^766887664 is an apocalyptic number.

It is an amenable number.

766887664 is a deficient number, since it is larger than the sum of its proper divisors (744142856).

766887664 is a wasteful number, since it uses less digits than its factorization.

766887664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812448 (or 812442 counting only the distinct ones).

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

The square root of 766887664 is about 27692.7366650535. The cubic root of 766887664 is about 915.3290599837.

The spelling of 766887664 in words is "seven hundred sixty-six million, eight hundred eighty-seven thousand, six hundred sixty-four".