28576521311 has 4 divisors (see below), whose sum is σ = 30774715272. Its totient is φ = 26378327352.

The previous prime is 28576521299. The next prime is 28576521313. The reversal of 28576521311 is 11312567582.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28576521311 - 2²⁶ = 28509412447 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28576521313) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1099096961 + ... + 1099096986.

It is an arithmetic number, because the mean of its divisors is an integer number (7693678818).

Almost surely, 2^28576521311 is an apocalyptic number.

28576521311 is a deficient number, since it is larger than the sum of its proper divisors (2198193961).

28576521311 is a wasteful number, since it uses less digits than its factorization.

28576521311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2198193960.

The product of its digits is 100800, while the sum is 41.

The spelling of 28576521311 in words is "twenty-eight billion, five hundred seventy-six million, five hundred twenty-one thousand, three hundred eleven".