28440208505 has 16 divisors (see below), whose sum is σ = 35352737280. Its totient is φ = 21937960128.

The previous prime is 28440208499. The next prime is 28440208519. The reversal of 28440208505 is 50580204482.

It is a cyclic number.

It is not a de Polignac number, because 28440208505 - 2³⁰ = 27366466681 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24257 + ... + 239726.

It is an arithmetic number, because the mean of its divisors is an integer number (2209546080).

Almost surely, 2^28440208505 is an apocalyptic number.

It is an amenable number.

28440208505 is a deficient number, since it is larger than the sum of its proper divisors (6912528775).

28440208505 is a wasteful number, since it uses less digits than its factorization.

28440208505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264760.

The product of its (nonzero) digits is 102400, while the sum is 38.

The spelling of 28440208505 in words is "twenty-eight billion, four hundred forty million, two hundred eight thousand, five hundred five".