779665 has 16 divisors (see below), whose sum is σ = 1022400. Its totient is φ = 568512.

The previous prime is 779663. The next prime is 779693. The reversal of 779665 is 566977.

It is a cyclic number.

It is not a de Polignac number, because 779665 - 2¹ = 779663 is a prime.

It is not an unprimeable number, because it can be changed into a prime (779663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2614 + ... + 2896.

It is an arithmetic number, because the mean of its divisors is an integer number (63900).

2⁷⁷⁹⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

779665 is a deficient number, since it is larger than the sum of its proper divisors (242735).

779665 is a wasteful number, since it uses less digits than its factorization.

779665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336.

The product of its digits is 79380, while the sum is 40.

The square root of 779665 is about 882.9864098614. The cubic root of 779665 is about 92.0384606049.

It can be divided in two parts, 779 and 665, that added together give a square (1444 = 38²).

The spelling of 779665 in words is "seven hundred seventy-nine thousand, six hundred sixty-five".