9725128722036 has 288 divisors, whose sum is σ = 31908369991680. Its totient is φ = 2521395402624.

The previous prime is 9725128721999. The next prime is 9725128722037. The reversal of 9725128722036 is 6302278215279.

9725128722036 is a `hidden beast` number, since 9 + 7 + 2 + 512 + 8 + 72 + 20 + 36 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9725128722037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4286905 + ... + 6150431.

It is an arithmetic number, because the mean of its divisors is an integer number (110792951360).

Almost surely, 2^{9725128722036} 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 9725128722036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15954184995840).

9725128722036 is an abundant number, since it is smaller than the sum of its proper divisors (22183241269644).

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

9725128722036 is a wasteful number, since it uses less digits than its factorization.

9725128722036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1863625 (or 1863611 counting only the distinct ones).

The product of its (nonzero) digits is 5080320, while the sum is 54.

The spelling of 9725128722036 in words is "nine trillion, seven hundred twenty-five billion, one hundred twenty-eight million, seven hundred twenty-two thousand, thirty-six".