28378860255 has 24 divisors (see below), whose sum is σ = 50776801920. Its totient is φ = 14647152960.

The previous prime is 28378860221. The next prime is 28378860259. The reversal of 28378860255 is 55206887382.

28378860255 is a `hidden beast` number, since 28 + 3 + 7 + 8 + 8 + 602 + 5 + 5 = 666.

It is not a de Polignac number, because 28378860255 - 2¹⁸ = 28378598111 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28378860259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10170240 + ... + 10173029.

It is an arithmetic number, because the mean of its divisors is an integer number (2115700080).

Almost surely, 2^28378860255 is an apocalyptic number.

28378860255 is a deficient number, since it is larger than the sum of its proper divisors (22397941665).

28378860255 is a wasteful number, since it uses less digits than its factorization.

28378860255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20343311 (or 20343308 counting only the distinct ones).

The product of its (nonzero) digits is 6451200, while the sum is 54.

The spelling of 28378860255 in words is "twenty-eight billion, three hundred seventy-eight million, eight hundred sixty thousand, two hundred fifty-five".