4065728091 has 32 divisors (see below), whose sum is σ = 5985346560. Its totient is φ = 2445209856.

The previous prime is 4065728083. The next prime is 4065728099. The reversal of 4065728091 is 1908275604.

It is an interprime number because it is at equal distance from previous prime (4065728083) and next prime (4065728099).

It is not a de Polignac number, because 4065728091 - 2³ = 4065728083 is a prime.

It is not an unprimeable number, because it can be changed into a prime (4065728099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78615 + ... + 119631.

It is an arithmetic number, because the mean of its divisors is an integer number (187042080).

Almost surely, 2^4065728091 is an apocalyptic number.

4065728091 is a deficient number, since it is larger than the sum of its proper divisors (1919618469).

4065728091 is a wasteful number, since it uses less digits than its factorization.

4065728091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41123.

The product of its (nonzero) digits is 120960, while the sum is 42.

The square root of 4065728091 is about 63763.0621206353. The cubic root of 4065728091 is about 1596.0485947132.

The spelling of 4065728091 in words is "four billion, sixty-five million, seven hundred twenty-eight thousand, ninety-one".