9809765864 has 8 divisors (see below), whose sum is σ = 18393311010. Its totient is φ = 4904882928.

The previous prime is 9809765843. The next prime is 9809765893. The reversal of 9809765864 is 4685679089.

It can be written as a sum of positive squares in only one way, i.e., 9378372964 + 431392900 = 96842^2 + 20770^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 9809765797 and 9809765806.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 613110359 + ... + 613110374.

Almost surely, 2^9809765864 is an apocalyptic number.

It is an amenable number.

9809765864 is a deficient number, since it is larger than the sum of its proper divisors (8583545146).

9809765864 is a wasteful number, since it uses less digits than its factorization.

9809765864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1226220739 (or 1226220735 counting only the distinct ones).

The product of its (nonzero) digits is 26127360, while the sum is 62.

The square root of 9809765864 is about 99044.2621457700. The cubic root of 9809765864 is about 2140.6855654262.

The spelling of 9809765864 in words is "nine billion, eight hundred nine million, seven hundred sixty-five thousand, eight hundred sixty-four".