28757591009 has 8 divisors (see below), whose sum is σ = 32895462720. Its totient is φ = 24627130416.

The previous prime is 28757590987. The next prime is 28757591011. The reversal of 28757591009 is 90019575782.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28757591009 - 2⁸ = 28757590753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28757591069) 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, 1844459 + ... + 1859984.

It is an arithmetic number, because the mean of its divisors is an integer number (4111932840).

Almost surely, 2^28757591009 is an apocalyptic number.

It is an amenable number.

28757591009 is a deficient number, since it is larger than the sum of its proper divisors (4137871711).

28757591009 is a wasteful number, since it uses less digits than its factorization.

28757591009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3705559.

The product of its (nonzero) digits is 1587600, while the sum is 53.

The spelling of 28757591009 in words is "twenty-eight billion, seven hundred fifty-seven million, five hundred ninety-one thousand, nine".