28385786308831 has 16 divisors (see below), whose sum is σ = 32489185247488. Its totient is φ = 24294461932800.

The previous prime is 28385786308801. The next prime is 28385786308927. The reversal of 28385786308831 is 13880368758382.

It is a cyclic number.

It is not a de Polignac number, because 28385786308831 - 2¹⁵ = 28385786276063 is a prime.

It is a super-2 number, since 2×28385786308831² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28385786308801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132237916 + ... + 132452398.

It is an arithmetic number, because the mean of its divisors is an integer number (2030574077968).

Almost surely, 2^{28385786308831} is an apocalyptic number.

28385786308831 is a deficient number, since it is larger than the sum of its proper divisors (4103398938657).

28385786308831 is a wasteful number, since it uses less digits than its factorization.

28385786308831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242542.

The product of its (nonzero) digits is 371589120, while the sum is 70.

The spelling of 28385786308831 in words is "twenty-eight trillion, three hundred eighty-five billion, seven hundred eighty-six million, three hundred eight thousand, eight hundred thirty-one".