765566138 has 16 divisors (see below), whose sum is σ = 1158378624. Its totient is φ = 379448160.

The previous prime is 765566129. The next prime is 765566141. The reversal of 765566138 is 831665567.

It is a junction number, because it is equal to n+sod(n) for n = 765566092 and 765566101.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 248081 + ... + 251147.

It is an arithmetic number, because the mean of its divisors is an integer number (72398664).

Almost surely, 2^765566138 is an apocalyptic number.

765566138 is a deficient number, since it is larger than the sum of its proper divisors (392812486).

765566138 is a wasteful number, since it uses less digits than its factorization.

765566138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4117.

The product of its digits is 907200, while the sum is 47.

The square root of 765566138 is about 27668.8658603854. The cubic root of 765566138 is about 914.8029826543.

The spelling of 765566138 in words is "seven hundred sixty-five million, five hundred sixty-six thousand, one hundred thirty-eight".