28366825505 has 4 divisors (see below), whose sum is σ = 34040190612. Its totient is φ = 22693460400.

The previous prime is 28366825499. The next prime is 28366825541. The reversal of 28366825505 is 50552866382.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3390499984 + 24976325521 = 58228^2 + 158039^2 .

It is not a de Polignac number, because 28366825505 - 2³⁰ = 27293083681 is a prime.

It is a super-2 number, since 2×28366825505² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2836682546 + ... + 2836682555.

It is an arithmetic number, because the mean of its divisors is an integer number (8510047653).

Almost surely, 2^28366825505 is an apocalyptic number.

It is an amenable number.

28366825505 is a deficient number, since it is larger than the sum of its proper divisors (5673365107).

28366825505 is an equidigital number, since it uses as much as digits as its factorization.

28366825505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5673365106.

The product of its (nonzero) digits is 3456000, while the sum is 50.

The spelling of 28366825505 in words is "twenty-eight billion, three hundred sixty-six million, eight hundred twenty-five thousand, five hundred five".