7128244509 has 16 divisors (see below), whose sum is σ = 9772641792. Its totient is φ = 4618306368.

The previous prime is 7128244499. The next prime is 7128244511. The reversal of 7128244509 is 9054428217.

It is not a de Polignac number, because 7128244509 - 2¹⁷ = 7128113437 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7128244559) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58587 + ... + 132999.

It is an arithmetic number, because the mean of its divisors is an integer number (610790112).

Almost surely, 2^7128244509 is an apocalyptic number.

It is an amenable number.

7128244509 is a deficient number, since it is larger than the sum of its proper divisors (2644397283).

7128244509 is a wasteful number, since it uses less digits than its factorization.

7128244509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75316.

The product of its (nonzero) digits is 161280, while the sum is 42.

The square root of 7128244509 is about 84428.9317059028. The cubic root of 7128244509 is about 1924.5426031054.

The spelling of 7128244509 in words is "seven billion, one hundred twenty-eight million, two hundred forty-four thousand, five hundred nine".