9971806928 has 10 divisors (see below), whose sum is σ = 19320375954. Its totient is φ = 4985903456.

The previous prime is 9971806891. The next prime is 9971806967. The reversal of 9971806928 is 8296081799.

It can be written as a sum of positive squares in only one way, i.e., 9766973584 + 204833344 = 98828^2 + 14312^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 311618951 + ... + 311618982.

Almost surely, 2^9971806928 is an apocalyptic number.

It is an amenable number.

9971806928 is a deficient number, since it is larger than the sum of its proper divisors (9348569026).

9971806928 is a wasteful number, since it uses less digits than its factorization.

9971806928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623237941 (or 623237935 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 59.

The square root of 9971806928 is about 99858.9351435313. The cubic root of 9971806928 is about 2152.4081132450.

The spelling of 9971806928 in words is "nine billion, nine hundred seventy-one million, eight hundred six thousand, nine hundred twenty-eight".