28831094991 has 32 divisors (see below), whose sum is σ = 43645547520. Its totient is φ = 18801415872.

The previous prime is 28831094989. The next prime is 28831095043. The reversal of 28831094991 is 19949013882.

28831094991 is a `hidden beast` number, since 288 + 310 + 9 + 49 + 9 + 1 = 666.

It is not a de Polignac number, because 28831094991 - 2¹ = 28831094989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28831094921) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2790451 + ... + 2800763.

It is an arithmetic number, because the mean of its divisors is an integer number (1363923360).

Almost surely, 2^28831094991 is an apocalyptic number.

28831094991 is a deficient number, since it is larger than the sum of its proper divisors (14814452529).

28831094991 is a wasteful number, since it uses less digits than its factorization.

28831094991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12572 (or 12566 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The spelling of 28831094991 in words is "twenty-eight billion, eight hundred thirty-one million, ninety-four thousand, nine hundred ninety-one".