768128561 has 8 divisors (see below), whose sum is σ = 856118880. Its totient is φ = 684894528.

The previous prime is 768128503. The next prime is 768128593. The reversal of 768128561 is 165821867.

It is a happy number.

768128561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 768128561 - 2¹⁸ = 767866417 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (768128161) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1188731 + ... + 1189376.

It is an arithmetic number, because the mean of its divisors is an integer number (107014860).

Almost surely, 2^768128561 is an apocalyptic number.

It is an amenable number.

768128561 is a deficient number, since it is larger than the sum of its proper divisors (87990319).

768128561 is a wasteful number, since it uses less digits than its factorization.

768128561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2378143.

The product of its digits is 161280, while the sum is 44.

The square root of 768128561 is about 27715.1323467885. The cubic root of 768128561 is about 915.8224903610.

The spelling of 768128561 in words is "seven hundred sixty-eight million, one hundred twenty-eight thousand, five hundred sixty-one".