9920648972 has 24 divisors (see below), whose sum is σ = 19509506016. Its totient is φ = 4379683968.

The previous prime is 9920648971. The next prime is 9920648977. The reversal of 9920648972 is 2798460299.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (9920648971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4146233 + ... + 4148624.

It is an arithmetic number, because the mean of its divisors is an integer number (812896084).

Almost surely, 2^9920648972 is an apocalyptic number.

9920648972 is a gapful number since it is divisible by the number (92) formed by its first and last digit.

It is an amenable number.

9920648972 is a deficient number, since it is larger than the sum of its proper divisors (9588857044).

9920648972 is a wasteful number, since it uses less digits than its factorization.

9920648972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8294897 (or 8294895 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 56.

The square root of 9920648972 is about 99602.4546484674. The cubic root of 9920648972 is about 2148.7209967813.

The spelling of 9920648972 in words is "nine billion, nine hundred twenty million, six hundred forty-eight thousand, nine hundred seventy-two".