28055775555 has 12 divisors (see below), whose sum is σ = 48630011040. Its totient is φ = 14963080272.

The previous prime is 28055775551. The next prime is 28055775557. The reversal of 28055775555 is 55557755082.

28055775555 is a `hidden beast` number, since 2 + 80 + 5 + 5 + 7 + 7 + 5 + 555 = 666.

It is not a de Polignac number, because 28055775555 - 2² = 28055775551 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28055775551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 311730795 + ... + 311730884.

It is an arithmetic number, because the mean of its divisors is an integer number (4052500920).

Almost surely, 2^28055775555 is an apocalyptic number.

28055775555 is a deficient number, since it is larger than the sum of its proper divisors (20574235485).

28055775555 is a wasteful number, since it uses less digits than its factorization.

28055775555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623461690 (or 623461687 counting only the distinct ones).

The product of its (nonzero) digits is 12250000, while the sum is 54.

The spelling of 28055775555 in words is "twenty-eight billion, fifty-five million, seven hundred seventy-five thousand, five hundred fifty-five".