28178778038789 has 8 divisors (see below), whose sum is σ = 32283056925120. Its totient is φ = 24094183944096.

The previous prime is 28178778038771. The next prime is 28178778038809. The reversal of 28178778038789 is 98783087787182.

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

It is not a de Polignac number, because 28178778038789 - 2⁸ = 28178778038533 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 (28178778838789) 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, 4921194839 + ... + 4921200564.

It is an arithmetic number, because the mean of its divisors is an integer number (4035382115640).

Almost surely, 2^{28178778038789} is an apocalyptic number.

It is an amenable number.

28178778038789 is a deficient number, since it is larger than the sum of its proper divisors (4104278886331).

28178778038789 is an equidigital number, since it uses as much as digits as its factorization.

28178778038789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9842395819.

The product of its (nonzero) digits is 4248502272, while the sum is 83.

The spelling of 28178778038789 in words is "twenty-eight trillion, one hundred seventy-eight billion, seven hundred seventy-eight million, thirty-eight thousand, seven hundred eighty-nine".