28004428164168 has 48 divisors (see below), whose sum is σ = 75912505706700. Its totient is φ = 9326541150720.

The previous prime is 28004428164151. The next prime is 28004428164179. The reversal of 28004428164168 is 86146182440082.

28004428164168 is a `hidden beast` number, since 2 + 8 + 0 + 0 + 442 + 81 + 64 + 1 + 68 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27999358439364 + 5069724804 = 5291442^2 + 71202^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 172173093 + ... + 172335668.

Almost surely, 2^{28004428164168} is an apocalyptic number.

It is an amenable number.

28004428164168 is an abundant number, since it is smaller than the sum of its proper divisors (47908077542532).

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

28004428164168 is a wasteful number, since it uses less digits than its factorization.

28004428164168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344509902 (or 344509895 counting only the distinct ones).

The product of its (nonzero) digits is 4718592, while the sum is 54.

The spelling of 28004428164168 in words is "twenty-eight trillion, four billion, four hundred twenty-eight million, one hundred sixty-four thousand, one hundred sixty-eight".