768764989 has 4 divisors (see below), whose sum is σ = 770645020. Its totient is φ = 766884960.

The previous prime is 768764959. The next prime is 768764999. The reversal of 768764989 is 989467867.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 690796089 + 77968900 = 26283^2 + 8830^2 .

It is a cyclic number.

It is not a de Polignac number, because 768764989 - 2¹¹ = 768762941 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 768764989.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (768764929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 939402 + ... + 940219.

It is an arithmetic number, because the mean of its divisors is an integer number (192661255).

Almost surely, 2^768764989 is an apocalyptic number.

It is an amenable number.

768764989 is a deficient number, since it is larger than the sum of its proper divisors (1880031).

768764989 is a wasteful number, since it uses less digits than its factorization.

768764989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1880030.

The product of its digits is 36578304, while the sum is 64.

The square root of 768764989 is about 27726.6115672291. The cubic root of 768764989 is about 916.0753534909.

The spelling of 768764989 in words is "seven hundred sixty-eight million, seven hundred sixty-four thousand, nine hundred eighty-nine".