771728 has 20 divisors (see below), whose sum is σ = 1510320. Its totient is φ = 381984.

The previous prime is 771703. The next prime is 771739. The reversal of 771728 is 827177.

771728 is nontrivially palindromic in base 7.

It is a junction number, because it is equal to n+sod(n) for n = 771694 and 771703.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2051 + ... + 2397.

It is an arithmetic number, because the mean of its divisors is an integer number (75516).

2⁷⁷¹⁷²⁸ is an apocalyptic number.

It is an amenable number.

771728 is a deficient number, since it is larger than the sum of its proper divisors (738592).

771728 is a wasteful number, since it uses less digits than its factorization.

771728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494 (or 488 counting only the distinct ones).

The product of its digits is 5488, while the sum is 32.

The square root of 771728 is about 878.4805063290. The cubic root of 771728 is about 91.7250771895.

The spelling of 771728 in words is "seven hundred seventy-one thousand, seven hundred twenty-eight".