766388664 has 48 divisors (see below), whose sum is σ = 2076909120. Its totient is φ = 255306240.

The previous prime is 766388653. The next prime is 766388669. The reversal of 766388664 is 466883667.

It is a self number, because there is not a number n which added to its sum of digits gives 766388664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (766388669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 226344 + ... + 229704.

It is an arithmetic number, because the mean of its divisors is an integer number (43268940).

Almost surely, 2^766388664 is an apocalyptic number.

It is an amenable number.

766388664 is an abundant number, since it is smaller than the sum of its proper divisors (1310520456).

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

766388664 is a wasteful number, since it uses less digits than its factorization.

766388664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6540 (or 6533 counting only the distinct ones).

The product of its digits is 6967296, while the sum is 54.

The square root of 766388664 is about 27683.7256163256. The cubic root of 766388664 is about 915.1304875267.

The spelling of 766388664 in words is "seven hundred sixty-six million, three hundred eighty-eight thousand, six hundred sixty-four".