765964978 has 4 divisors (see below), whose sum is σ = 1148947470. Its totient is φ = 382982488.

The previous prime is 765964973. The next prime is 765964987. The reversal of 765964978 is 879469567.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 879469567 = 15727 ⋅55921.

It can be written as a sum of positive squares in only one way, i.e., 749828689 + 16136289 = 27383^2 + 4017^2 .

It is not an unprimeable number, because it can be changed into a prime (765964973) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191491243 + ... + 191491246.

Almost surely, 2^765964978 is an apocalyptic number.

765964978 is a deficient number, since it is larger than the sum of its proper divisors (382982492).

765964978 is a wasteful number, since it uses less digits than its factorization.

765964978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 382982491.

The product of its digits is 22861440, while the sum is 61.

The square root of 765964978 is about 27676.0723008161. The cubic root of 765964978 is about 914.9618179096.

The spelling of 765964978 in words is "seven hundred sixty-five million, nine hundred sixty-four thousand, nine hundred seventy-eight".