775728 has 30 divisors (see below), whose sum is σ = 2171364. Its totient is φ = 258528.

The previous prime is 775711. The next prime is 775729. The reversal of 775728 is 827577.

775728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 775692 and 775701.

It is not an unprimeable number, because it can be changed into a prime (775729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2550 + ... + 2837.

2⁷⁷⁵⁷²⁸ is an apocalyptic number.

It is an amenable number.

775728 is an abundant number, since it is smaller than the sum of its proper divisors (1395636).

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

775728 is a wasteful number, since it uses less digits than its factorization.

775728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5401 (or 5392 counting only the distinct ones).

The product of its digits is 27440, while the sum is 36.

The square root of 775728 is about 880.7542222436. The cubic root of 775728 is about 91.8832798313.

The spelling of 775728 in words is "seven hundred seventy-five thousand, seven hundred twenty-eight".