4209091728 has 40 divisors (see below), whose sum is σ = 10890219648. Its totient is φ = 1400871552.

The previous prime is 4209091723. The next prime is 4209091739. The reversal of 4209091728 is 8271909024.

It is a self number, because there is not a number n which added to its sum of digits gives 4209091728.

It is not an unprimeable number, because it can be changed into a prime (4209091723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35800 + ... + 98487.

Almost surely, 2^4209091728 is an apocalyptic number.

4209091728 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

4209091728 is an abundant number, since it is smaller than the sum of its proper divisors (6681127920).

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

4209091728 is a wasteful number, since it uses less digits than its factorization.

4209091728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134951 (or 134945 counting only the distinct ones).

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 4209091728 is about 64877.5132692368. The cubic root of 4209091728 is about 1614.5920017837.

The spelling of 4209091728 in words is "four billion, two hundred nine million, ninety-one thousand, seven hundred twenty-eight".