765726381 has 72 divisors (see below), whose sum is σ = 1346841600. Its totient is φ = 417493440.

The previous prime is 765726371. The next prime is 765726431. The reversal of 765726381 is 183627567.

765726381 is a `hidden beast` number, since 7 + 6 + 5 + 7 + 2 + 638 + 1 = 666.

765726381 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 765726381 - 2¹⁰ = 765725357 is a prime.

It is a super-2 number, since 2×765726381² = 1172673781118714322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (765726301) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1079655 + ... + 1080363.

Almost surely, 2^765726381 is an apocalyptic number.

It is an amenable number.

765726381 is a deficient number, since it is larger than the sum of its proper divisors (581115219).

765726381 is a wasteful number, since it uses less digits than its factorization.

765726381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 839 (or 829 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 765726381 is about 27671.7614365259. The cubic root of 765726381 is about 914.8668049423.

The spelling of 765726381 in words is "seven hundred sixty-five million, seven hundred twenty-six thousand, three hundred eighty-one".