28217100555 has 36 divisors (see below), whose sum is σ = 56894892912. Its totient is φ = 12899244960.

The previous prime is 28217100547. The next prime is 28217100577. The reversal of 28217100555 is 55500171282.

28217100555 is a `hidden beast` number, since 2 + 82 + 17 + 10 + 0 + 555 = 666.

It is not a de Polignac number, because 28217100555 - 2³ = 28217100547 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 6396231 + ... + 6400640.

It is an arithmetic number, because the mean of its divisors is an integer number (1580413692).

Almost surely, 2^28217100555 is an apocalyptic number.

28217100555 is an abundant number, since it is smaller than the sum of its proper divisors (28677792357).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28217100555 is a wasteful number, since it uses less digits than its factorization.

28217100555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12796896 (or 12796886 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 36.

The spelling of 28217100555 in words is "twenty-eight billion, two hundred seventeen million, one hundred thousand, five hundred fifty-five".