28809553839781 has 8 divisors (see below), whose sum is σ = 33846189126624. Its totient is φ = 24175849375920.

The previous prime is 28809553839739. The next prime is 28809553839851. The reversal of 28809553839781 is 18793835590882.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28809553839781 - 2³¹ = 28807406356133 is a prime.

It is a super-3 number, since 3×28809553839781³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28809553839698 and 28809553839707.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28809553839581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100732705591 + ... + 100732705876.

It is an arithmetic number, because the mean of its divisors is an integer number (4230773640828).

Almost surely, 2^{28809553839781} is an apocalyptic number.

It is an amenable number.

28809553839781 is a deficient number, since it is larger than the sum of its proper divisors (5036635286843).

28809553839781 is a wasteful number, since it uses less digits than its factorization.

28809553839781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201465411491.

The product of its (nonzero) digits is 1045094400, while the sum is 76.

The spelling of 28809553839781 in words is "twenty-eight trillion, eight hundred nine billion, five hundred fifty-three million, eight hundred thirty-nine thousand, seven hundred eighty-one".