9729640808 has 16 divisors (see below), whose sum is σ = 18404521380. Its totient is φ = 4821768448.

The previous prime is 9729640807. The next prime is 9729640813. The reversal of 9729640808 is 8080469279.

It can be written as a sum of positive squares in 2 ways, for example, as 6483148324 + 3246492484 = 80518^2 + 56978^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 9729640808.

It is not an unprimeable number, because it can be changed into a prime (9729640807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5380535 + ... + 5382342.

Almost surely, 2^9729640808 is an apocalyptic number.

It is an amenable number.

9729640808 is a deficient number, since it is larger than the sum of its proper divisors (8674880572).

9729640808 is a wasteful number, since it uses less digits than its factorization.

9729640808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10762996 (or 10762992 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 53.

The square root of 9729640808 is about 98638.9416407131. The cubic root of 9729640808 is about 2134.8413323721.

The spelling of 9729640808 in words is "nine billion, seven hundred twenty-nine million, six hundred forty thousand, eight hundred eight".