765428 has 12 divisors (see below), whose sum is σ = 1361892. Its totient is φ = 376320.

The previous prime is 765409. The next prime is 765437. The reversal of 765428 is 824567.

It can be written as a sum of positive squares in 2 ways, for example, as 438244 + 327184 = 662^2 + 572^2 .

It is a junction number, because it is equal to n+sod(n) for n = 765394 and 765403.

It is a congruent number.

It is an unprimeable number.

765428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1325 + ... + 1812.

It is an arithmetic number, because the mean of its divisors is an integer number (113491).

2⁷⁶⁵⁴²⁸ is an apocalyptic number.

It is an amenable number.

765428 is a deficient number, since it is larger than the sum of its proper divisors (596464).

765428 is a wasteful number, since it uses less digits than its factorization.

765428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3202 (or 3200 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 765428 is about 874.8874213292. The cubic root of 765428 is about 91.4747957295.

The spelling of 765428 in words is "seven hundred sixty-five thousand, four hundred twenty-eight".