9451897728 has 384 divisors, whose sum is σ = 33317010720. Its totient is φ = 2345140224.

The previous prime is 9451897727. The next prime is 9451897739. The reversal of 9451897728 is 8277981549.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9451897727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4157200 + ... + 4159472.

Almost surely, 2^9451897728 is an apocalyptic number.

9451897728 is a gapful number since it is divisible by the number (98) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9451897728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16658505360).

9451897728 is an abundant number, since it is smaller than the sum of its proper divisors (23865112992).

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

9451897728 is a wasteful number, since it uses less digits than its factorization.

9451897728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2334 (or 2315 counting only the distinct ones).

The product of its digits is 10160640, while the sum is 60.

The square root of 9451897728 is about 97220.8708457191. The cubic root of 9451897728 is about 2114.3311324342.

The spelling of 9451897728 in words is "nine billion, four hundred fifty-one million, eight hundred ninety-seven thousand, seven hundred twenty-eight".