765734978 has 18 divisors (see below), whose sum is σ = 1221202713. Its totient is φ = 360032800.

The previous prime is 765734939. The next prime is 765734993. The reversal of 765734978 is 879437567.

It can be written as a sum of positive squares in 2 ways, for example, as 700819729 + 64915249 = 26473^2 + 8057^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=19567.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 664703 + ... + 665853.

Almost surely, 2^765734978 is an apocalyptic number.

765734978 is a deficient number, since it is larger than the sum of its proper divisors (455467735).

765734978 is an equidigital number, since it uses as much as digits as its factorization.

765734978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2338 (or 1170 counting only the distinct ones).

The product of its digits is 8890560, while the sum is 56.

The square root of 765734978 is about 27671.9167749544. The cubic root of 765734978 is about 914.8702287417.

The spelling of 765734978 in words is "seven hundred sixty-five million, seven hundred thirty-four thousand, nine hundred seventy-eight".