775428 has 36 divisors (see below), whose sum is σ = 1920240. Its totient is φ = 243504.

The previous prime is 775417. The next prime is 775441. The reversal of 775428 is 824577.

Its product of digits (15680) is a multiple of the sum of its prime factors (224).

It is an unprimeable number.

775428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4243 + ... + 4421.

It is an arithmetic number, because the mean of its divisors is an integer number (53340).

2⁷⁷⁵⁴²⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 775428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (960120).

775428 is an abundant number, since it is smaller than the sum of its proper divisors (1144812).

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

775428 is a wasteful number, since it uses less digits than its factorization.

775428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224 (or 203 counting only the distinct ones).

The product of its digits is 15680, while the sum is 33.

The square root of 775428 is about 880.5838971955. The cubic root of 775428 is about 91.8714335235.

The spelling of 775428 in words is "seven hundred seventy-five thousand, four hundred twenty-eight".