768661389 has 12 divisors (see below), whose sum is σ = 1124344000. Its totient is φ = 505953864.

The previous prime is 768661373. The next prime is 768661393. The reversal of 768661389 is 983166867.

It is a happy number.

It is not a de Polignac number, because 768661389 - 2⁴ = 768661373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (768661339) 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 11 ways as a sum of consecutive naturals, for example, 539839 + ... + 541260.

Almost surely, 2^768661389 is an apocalyptic number.

768661389 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

768661389 is a deficient number, since it is larger than the sum of its proper divisors (355682611).

768661389 is a wasteful number, since it uses less digits than its factorization.

768661389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1081184 (or 1081181 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 54.

The square root of 768661389 is about 27724.7432630133. The cubic root of 768661389 is about 916.0342010488.

The spelling of 768661389 in words is "seven hundred sixty-eight million, six hundred sixty-one thousand, three hundred eighty-nine".