11509594728 has 128 divisors (see below), whose sum is σ = 31274449920. Its totient is φ = 3516369920.

The previous prime is 11509594669. The next prime is 11509594757. The reversal of 11509594728 is 82749590511.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2401951 + ... + 2406737.

It is an arithmetic number, because the mean of its divisors is an integer number (244331640).

Almost surely, 2^11509594728 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 11509594728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15637224960).

11509594728 is an abundant number, since it is smaller than the sum of its proper divisors (19764855192).

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

11509594728 is a wasteful number, since it uses less digits than its factorization.

11509594728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4967 (or 4963 counting only the distinct ones).

The product of its (nonzero) digits is 907200, while the sum is 51.

The spelling of 11509594728 in words is "eleven billion, five hundred nine million, five hundred ninety-four thousand, seven hundred twenty-eight".