28831665897 has 6 divisors (see below), whose sum is σ = 41645739642. Its totient is φ = 19221110592.

The previous prime is 28831665887. The next prime is 28831665911. The reversal of 28831665897 is 79856613882.

It can be written as a sum of positive squares in only one way, i.e., 25598720016 + 3232945881 = 159996^2 + 56859^2 .

It is not a de Polignac number, because 28831665897 - 2⁷ = 28831665769 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28831665887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1601759208 + ... + 1601759225.

It is an arithmetic number, because the mean of its divisors is an integer number (6940956607).

Almost surely, 2^28831665897 is an apocalyptic number.

It is an amenable number.

28831665897 is a deficient number, since it is larger than the sum of its proper divisors (12814073745).

28831665897 is a wasteful number, since it uses less digits than its factorization.

28831665897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3203518439 (or 3203518436 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 63.

The spelling of 28831665897 in words is "twenty-eight billion, eight hundred thirty-one million, six hundred sixty-five thousand, eight hundred ninety-seven".