9640890385 has 24 divisors (see below), whose sum is σ = 13821635880. Its totient is φ = 6432217344.

The previous prime is 9640890361. The next prime is 9640890397. The reversal of 9640890385 is 5830980469.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2053086721 + 7587803664 = 45311^2 + 87108^2 .

It is a de Polignac number, because none of the positive numbers 2^k-9640890385 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 522700 + ... + 540829.

It is an arithmetic number, because the mean of its divisors is an integer number (575901495).

Almost surely, 2^9640890385 is an apocalyptic number.

It is an amenable number.

9640890385 is a deficient number, since it is larger than the sum of its proper divisors (4180745495).

9640890385 is a wasteful number, since it uses less digits than its factorization.

9640890385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1063585 (or 1063578 counting only the distinct ones).

The product of its (nonzero) digits is 1866240, while the sum is 52.

The square root of 9640890385 is about 98188.0358546804. The cubic root of 9640890385 is about 2128.3304001353.

The spelling of 9640890385 in words is "nine billion, six hundred forty million, eight hundred ninety thousand, three hundred eighty-five".