768639 has 8 divisors (see below), whose sum is σ = 1031472. Its totient is φ = 509120.

The previous prime is 768631. The next prime is 768641. The reversal of 768639 is 936867.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 768639 - 2³ = 768631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 768597 and 768606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (768631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222 + ... + 1259.

It is an arithmetic number, because the mean of its divisors is an integer number (128934).

2⁷⁶⁸⁶³⁹ is an apocalyptic number.

768639 is a deficient number, since it is larger than the sum of its proper divisors (262833).

768639 is a wasteful number, since it uses less digits than its factorization.

768639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657.

The product of its digits is 54432, while the sum is 39.

The square root of 768639 is about 876.7205940321. The cubic root of 768639 is about 91.6025307107.

The spelling of 768639 in words is "seven hundred sixty-eight thousand, six hundred thirty-nine".