28310731911 has 72 divisors (see below), whose sum is σ = 52419130400. Its totient is φ = 14706679680.

The previous prime is 28310731837. The next prime is 28310731919. The reversal of 28310731911 is 11913701382.

28310731911 is a `hidden beast` number, since 28 + 310 + 7 + 319 + 1 + 1 = 666.

It is not a de Polignac number, because 28310731911 - 2⁹ = 28310731399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28310731919) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 335631 + ... + 411423.

Almost surely, 2^28310731911 is an apocalyptic number.

28310731911 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28310731911 is a deficient number, since it is larger than the sum of its proper divisors (24108398489).

28310731911 is a wasteful number, since it uses less digits than its factorization.

28310731911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75842 (or 75814 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The spelling of 28310731911 in words is "twenty-eight billion, three hundred ten million, seven hundred thirty-one thousand, nine hundred eleven".