788665 has 4 divisors (see below), whose sum is σ = 946404. Its totient is φ = 630928.

The previous prime is 788659. The next prime is 788677. The reversal of 788665 is 566887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 566887 = 67 ⋅8461.

It can be written as a sum of positive squares in 2 ways, for example, as 274576 + 514089 = 524^2 + 717^2 .

It is a cyclic number.

It is not a de Polignac number, because 788665 - 2⁷ = 788537 is a prime.

It is a Duffinian number.

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, 78862 + ... + 78871.

It is an arithmetic number, because the mean of its divisors is an integer number (236601).

2⁷⁸⁸⁶⁶⁵ is an apocalyptic number.

It is an amenable number.

788665 is a deficient number, since it is larger than the sum of its proper divisors (157739).

788665 is a wasteful number, since it uses less digits than its factorization.

788665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157738.

The product of its digits is 80640, while the sum is 40.

The square root of 788665 is about 888.0681280172. The cubic root of 788665 is about 92.3912527716.

The spelling of 788665 in words is "seven hundred eighty-eight thousand, six hundred sixty-five".