768321513 has 6 divisors (see below), whose sum is σ = 1109797754. Its totient is φ = 512214336.

The previous prime is 768321493. The next prime is 768321523. The reversal of 768321513 is 315123867.

It can be written as a sum of positive squares in only one way, i.e., 725117184 + 43204329 = 26928^2 + 6573^2 .

It is not a de Polignac number, because 768321513 - 2⁵ = 768321481 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (768321523) 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 5 ways as a sum of consecutive naturals, for example, 42684520 + ... + 42684537.

Almost surely, 2^768321513 is an apocalyptic number.

It is an amenable number.

768321513 is a deficient number, since it is larger than the sum of its proper divisors (341476241).

768321513 is a wasteful number, since it uses less digits than its factorization.

768321513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85369063 (or 85369060 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 768321513 is about 27718.6131146564. The cubic root of 768321513 is about 915.8991680579.

The spelling of 768321513 in words is "seven hundred sixty-eight million, three hundred twenty-one thousand, five hundred thirteen".