28321665105 has 16 divisors (see below), whose sum is σ = 45317061504. Its totient is φ = 15104088960.

The previous prime is 28321665077. The next prime is 28321665137. The reversal of 28321665105 is 50156612382.

It is not a de Polignac number, because 28321665105 - 2⁸ = 28321664849 is a prime.

It is a super-2 number, since 2×28321665105² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 342532 + ... + 417098.

It is an arithmetic number, because the mean of its divisors is an integer number (2832316344).

Almost surely, 2^28321665105 is an apocalyptic number.

It is an amenable number.

28321665105 is a deficient number, since it is larger than the sum of its proper divisors (16995396399).

28321665105 is a wasteful number, since it uses less digits than its factorization.

28321665105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99896.

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 28321665105 in words is "twenty-eight billion, three hundred twenty-one million, six hundred sixty-five thousand, one hundred five".