28005302505 has 16 divisors (see below), whose sum is σ = 46253919744. Its totient is φ = 14454349440.

The previous prime is 28005302497. The next prime is 28005302543. The reversal of 28005302505 is 50520350082.

It is not a de Polignac number, because 28005302505 - 2³ = 28005302497 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30112764 + ... + 30113693.

It is an arithmetic number, because the mean of its divisors is an integer number (2890869984).

Almost surely, 2^28005302505 is an apocalyptic number.

It is an amenable number.

28005302505 is a deficient number, since it is larger than the sum of its proper divisors (18248617239).

28005302505 is a wasteful number, since it uses less digits than its factorization.

28005302505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60226496.

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 28005302505 its reverse (50520350082), we get a palindrome (78525652587).

The spelling of 28005302505 in words is "twenty-eight billion, five million, three hundred two thousand, five hundred five".