765540378 has 12 divisors (see below), whose sum is σ = 1658670858. Its totient is φ = 255180120.

The previous prime is 765540329. The next prime is 765540401. The reversal of 765540378 is 873045567.

765540378 is a `hidden beast` number, since 76 + 5 + 540 + 37 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 426133449 + 339406929 = 20643^2 + 18423^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21264993 + ... + 21265028.

Almost surely, 2^765540378 is an apocalyptic number.

765540378 is an abundant number, since it is smaller than the sum of its proper divisors (893130480).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

765540378 is a wasteful number, since it uses less digits than its factorization.

765540378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42530029 (or 42530026 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 45.

The square root of 765540378 is about 27668.4003513033. The cubic root of 765540378 is about 914.7927220171.

The spelling of 765540378 in words is "seven hundred sixty-five million, five hundred forty thousand, three hundred seventy-eight".