768391645 has 8 divisors (see below), whose sum is σ = 1053794304. Its totient is φ = 526897104.

The previous prime is 768391643. The next prime is 768391661. The reversal of 768391645 is 546193867.

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 768391645 - 2¹ = 768391643 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 (768391643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10976989 + ... + 10977058.

It is an arithmetic number, because the mean of its divisors is an integer number (131724288).

Almost surely, 2^768391645 is an apocalyptic number.

It is an amenable number.

768391645 is a deficient number, since it is larger than the sum of its proper divisors (285402659).

768391645 is a wasteful number, since it uses less digits than its factorization.

768391645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21954059.

The product of its digits is 1088640, while the sum is 49.

The square root of 768391645 is about 27719.8781562979. The cubic root of 768391645 is about 915.9270348146.

The spelling of 768391645 in words is "seven hundred sixty-eight million, three hundred ninety-one thousand, six hundred forty-five".