28864216877 has 4 divisors (see below), whose sum is σ = 28864578780. Its totient is φ = 28863854976.

The previous prime is 28864216813. The next prime is 28864216879. The reversal of 28864216877 is 77861246882.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 7074323881 + 21789892996 = 84109^2 + 147614^2 .

It is a cyclic number.

It is not a de Polignac number, because 28864216877 - 2⁶ = 28864216813 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 (28864216879) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2948 + ... + 240285.

It is an arithmetic number, because the mean of its divisors is an integer number (7216144695).

Almost surely, 2^28864216877 is an apocalyptic number.

It is an amenable number.

28864216877 is a deficient number, since it is larger than the sum of its proper divisors (361903).

28864216877 is a wasteful number, since it uses less digits than its factorization.

28864216877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361902.

The product of its digits is 14450688, while the sum is 59.

The spelling of 28864216877 in words is "twenty-eight billion, eight hundred sixty-four million, two hundred sixteen thousand, eight hundred seventy-seven".