9447646428 has 144 divisors (see below), whose sum is σ = 28063107072. Its totient is φ = 2650032000.

The previous prime is 9447646421. The next prime is 9447646513. The reversal of 9447646428 is 8246467449.

9447646428 is a `hidden beast` number, since 94 + 4 + 76 + 464 + 28 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9447646421) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 265618 + ... + 299078.

It is an arithmetic number, because the mean of its divisors is an integer number (194882688).

Almost surely, 2^9447646428 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 9447646428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14031553536).

9447646428 is an abundant number, since it is smaller than the sum of its proper divisors (18615460644).

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

9447646428 is a wasteful number, since it uses less digits than its factorization.

9447646428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33536 (or 33531 counting only the distinct ones).

The product of its digits is 9289728, while the sum is 54.

The square root of 9447646428 is about 97199.0042541589. The cubic root of 9447646428 is about 2114.0140883800.

The spelling of 9447646428 in words is "nine billion, four hundred forty-seven million, six hundred forty-six thousand, four hundred twenty-eight".