768911657 has 4 divisors (see below), whose sum is σ = 769040580. Its totient is φ = 768782736.

The previous prime is 768911653. The next prime is 768911723. The reversal of 768911657 is 756119867.

768911657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 134073241 + 634838416 = 11579^2 + 25196^2 .

It is a cyclic number.

It is not a de Polignac number, because 768911657 - 2² = 768911653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (768911653) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55058 + ... + 67595.

It is an arithmetic number, because the mean of its divisors is an integer number (192260145).

Almost surely, 2^768911657 is an apocalyptic number.

It is an amenable number.

768911657 is a deficient number, since it is larger than the sum of its proper divisors (128923).

768911657 is a wasteful number, since it uses less digits than its factorization.

768911657 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128922.

The product of its digits is 635040, while the sum is 50.

The square root of 768911657 is about 27729.2563369449. The cubic root of 768911657 is about 916.1336072695.

The spelling of 768911657 in words is "seven hundred sixty-eight million, nine hundred eleven thousand, six hundred fifty-seven".