28255532777 has 4 divisors (see below), whose sum is σ = 28282418256. Its totient is φ = 28228647300.

The previous prime is 28255532761. The next prime is 28255532779. The reversal of 28255532777 is 77723555282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28255532777 - 2⁴ = 28255532761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28255532779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13441163 + ... + 13443264.

It is an arithmetic number, because the mean of its divisors is an integer number (7070604564).

Almost surely, 2^28255532777 is an apocalyptic number.

It is an amenable number.

28255532777 is a deficient number, since it is larger than the sum of its proper divisors (26885479).

28255532777 is a wasteful number, since it uses less digits than its factorization.

28255532777 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26885478.

The product of its digits is 8232000, while the sum is 53.

The spelling of 28255532777 in words is "twenty-eight billion, two hundred fifty-five million, five hundred thirty-two thousand, seven hundred seventy-seven".