765778013 has 32 divisors (see below), whose sum is σ = 1052147712. Its totient is φ = 537969600.

The previous prime is 765778007. The next prime is 765778049. The reversal of 765778013 is 310877567.

It is not a de Polignac number, because 765778013 - 2⁴ = 765777997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (765778063) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34148 + ... + 51938.

It is an arithmetic number, because the mean of its divisors is an integer number (32879616).

Almost surely, 2^765778013 is an apocalyptic number.

It is an amenable number.

765778013 is a deficient number, since it is larger than the sum of its proper divisors (286369699).

765778013 is a wasteful number, since it uses less digits than its factorization.

765778013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17865.

The product of its (nonzero) digits is 246960, while the sum is 44.

The square root of 765778013 is about 27672.6943574347. The cubic root of 765778013 is about 914.8873672661.

The spelling of 765778013 in words is "seven hundred sixty-five million, seven hundred seventy-eight thousand, thirteen".