28278278255 has 4 divisors (see below), whose sum is σ = 33933933912. Its totient is φ = 22622622600.

The previous prime is 28278278221. The next prime is 28278278269. The reversal of 28278278255 is 55287287282.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28278278255 - 2²⁴ = 28261501039 is a prime.

It is a super-2 number, since 2×28278278255² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28278278255.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2827827821 + ... + 2827827830.

It is an arithmetic number, because the mean of its divisors is an integer number (8483483478).

Almost surely, 2^28278278255 is an apocalyptic number.

28278278255 is a deficient number, since it is larger than the sum of its proper divisors (5655655657).

28278278255 is an equidigital number, since it uses as much as digits as its factorization.

28278278255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5655655656.

The product of its digits is 10035200, while the sum is 56.

The spelling of 28278278255 in words is "twenty-eight billion, two hundred seventy-eight million, two hundred seventy-eight thousand, two hundred fifty-five".