28775891711 has 16 divisors (see below), whose sum is σ = 33782030400. Its totient is φ = 23993832960.

The previous prime is 28775891689. The next prime is 28775891831. The reversal of 28775891711 is 11719857782.

It is a cyclic number.

It is not a de Polignac number, because 28775891711 - 2¹⁰ = 28775890687 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 (28775893711) 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, 2382215 + ... + 2394263.

It is an arithmetic number, because the mean of its divisors is an integer number (2111376900).

Almost surely, 2^28775891711 is an apocalyptic number.

28775891711 is a deficient number, since it is larger than the sum of its proper divisors (5006138689).

28775891711 is a wasteful number, since it uses less digits than its factorization.

28775891711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21314.

The product of its digits is 1975680, while the sum is 56.

The spelling of 28775891711 in words is "twenty-eight billion, seven hundred seventy-five million, eight hundred ninety-one thousand, seven hundred eleven".