775121128 has 8 divisors (see below), whose sum is σ = 1453352130. Its totient is φ = 387560560.

The previous prime is 775121111. The next prime is 775121143. The reversal of 775121128 is 821121577.

775121128 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 429235524 + 345885604 = 20718^2 + 18598^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 775121093 and 775121102.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48445063 + ... + 48445078.

Almost surely, 2^775121128 is an apocalyptic number.

It is an amenable number.

775121128 is a deficient number, since it is larger than the sum of its proper divisors (678231002).

775121128 is a wasteful number, since it uses less digits than its factorization.

775121128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96890147 (or 96890143 counting only the distinct ones).

The product of its digits is 7840, while the sum is 34.

The square root of 775121128 is about 27840.9972522537. The cubic root of 775121128 is about 918.5931269452.

The spelling of 775121128 in words is "seven hundred seventy-five million, one hundred twenty-one thousand, one hundred twenty-eight".