775128 has 16 divisors (see below), whose sum is σ = 1937880. Its totient is φ = 258368.

The previous prime is 775121. The next prime is 775147. The reversal of 775128 is 821577.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 775095 and 775104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775121) 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, 16125 + ... + 16172.

2⁷⁷⁵¹²⁸ is an apocalyptic number.

It is an amenable number.

775128 is an abundant number, since it is smaller than the sum of its proper divisors (1162752).

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

775128 is a wasteful number, since it uses less digits than its factorization.

775128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32306 (or 32302 counting only the distinct ones).

The product of its digits is 3920, while the sum is 30.

The square root of 775128 is about 880.4135391962. The cubic root of 775128 is about 91.8595841598.

It can be divided in two parts, 775 and 128, that added together give a triangular number (903 = T₄₂).

The spelling of 775128 in words is "seven hundred seventy-five thousand, one hundred twenty-eight".