9149977728 has 160 divisors (see below), whose sum is σ = 28832516460. Its totient is φ = 2870525952.

The previous prime is 9149977721. The next prime is 9149977747. The reversal of 9149977728 is 8277799419.

9149977728 is a `hidden beast` number, since 9 + 1 + 499 + 77 + 72 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 9018921024 + 131056704 = 94968^2 + 11448^2 .

It is not an unprimeable number, because it can be changed into a prime (9149977721) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 150300 + ... + 202212.

Almost surely, 2^9149977728 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 9149977728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14416258230).

9149977728 is an abundant number, since it is smaller than the sum of its proper divisors (19682538732).

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

9149977728 is a wasteful number, since it uses less digits than its factorization.

9149977728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51956 (or 51935 counting only the distinct ones).

The product of its digits is 16003008, while the sum is 63.

The square root of 9149977728 is about 95655.5159308652. The cubic root of 9149977728 is about 2091.5745350579.

The spelling of 9149977728 in words is "nine billion, one hundred forty-nine million, nine hundred seventy-seven thousand, seven hundred twenty-eight".