775665 has 24 divisors (see below), whose sum is σ = 1467648. Its totient is φ = 375840.

The previous prime is 775661. The next prime is 775669. The reversal of 775665 is 566577.

It is an interprime number because it is at equal distance from previous prime (775661) and next prime (775669).

It is not a de Polignac number, because 775665 - 2² = 775661 is a prime.

It is not an unprimeable number, because it can be changed into a prime (775661) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 289 + ... + 1278.

It is an arithmetic number, because the mean of its divisors is an integer number (61152).

2⁷⁷⁵⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

775665 is a deficient number, since it is larger than the sum of its proper divisors (691983).

775665 is a wasteful number, since it uses less digits than its factorization.

775665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1589 (or 1586 counting only the distinct ones).

The product of its digits is 44100, while the sum is 36.

The square root of 775665 is about 880.7184567159. The cubic root of 775665 is about 91.8807923601.

The spelling of 775665 in words is "seven hundred seventy-five thousand, six hundred sixty-five".