9979405620 has 96 divisors (see below), whose sum is σ = 29857766400. Its totient is φ = 2481629184.

The previous prime is 9979405609. The next prime is 9979405621. The reversal of 9979405620 is 265049799.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9979405621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 66301 + ... + 156059.

It is an arithmetic number, because the mean of its divisors is an integer number (311018400).

Almost surely, 2^9979405620 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9979405620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14928883200).

9979405620 is an abundant number, since it is smaller than the sum of its proper divisors (19878360780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9979405620 is a wasteful number, since it uses less digits than its factorization.

9979405620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89897 (or 89895 counting only the distinct ones).

The product of its (nonzero) digits is 1224720, while the sum is 51.

The square root of 9979405620 is about 99896.9750292770. The cubic root of 9979405620 is about 2152.9546986932.

The spelling of 9979405620 in words is "nine billion, nine hundred seventy-nine million, four hundred five thousand, six hundred twenty".