768680509 has 4 divisors (see below), whose sum is σ = 770597820. Its totient is φ = 766763200.

The previous prime is 768680503. The next prime is 768680533. The reversal of 768680509 is 905086867.

768680509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 905086867 = 2129 ⋅425123.

It can be written as a sum of positive squares in 2 ways, for example, as 370678009 + 398002500 = 19253^2 + 19950^2 .

It is a cyclic number.

It is not a de Polignac number, because 768680509 - 2³ = 768680501 is a prime.

It is a super-3 number, since 3×768680509³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (768680501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 958054 + ... + 958855.

It is an arithmetic number, because the mean of its divisors is an integer number (192649455).

Almost surely, 2^768680509 is an apocalyptic number.

It is an amenable number.

768680509 is a deficient number, since it is larger than the sum of its proper divisors (1917311).

768680509 is a wasteful number, since it uses less digits than its factorization.

768680509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1917310.

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 768680509 is about 27725.0880792109. The cubic root of 768680509 is about 916.0417962565.

The spelling of 768680509 in words is "seven hundred sixty-eight million, six hundred eighty thousand, five hundred nine".