28711711 has 16 divisors (see below), whose sum is σ = 34467840. Its totient is φ = 23395680.

The previous prime is 28711687. The next prime is 28711723. The reversal of 28711711 is 11711782.

It is not a de Polignac number, because 28711711 - 2¹¹ = 28709663 is a prime.

It is a super-3 number, since 3×28711711³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28711711.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28711211) 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, 12546 + ... + 14656.

It is an arithmetic number, because the mean of its divisors is an integer number (2154240).

Almost surely, 2^28711711 is an apocalyptic number.

28711711 is a deficient number, since it is larger than the sum of its proper divisors (5756129).

28711711 is a wasteful number, since it uses less digits than its factorization.

28711711 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214.

The product of its digits is 784, while the sum is 28.

The square root of 28711711 is about 5358.3309901498. The cubic root of 28711711 is about 306.2102269048.

The spelling of 28711711 in words is "twenty-eight million, seven hundred eleven thousand, seven hundred eleven".