28356322505 has 32 divisors (see below), whose sum is σ = 39019352064. Its totient is φ = 19379134656.

The previous prime is 28356322499. The next prime is 28356322537. The reversal of 28356322505 is 50522365382.

It is not a de Polignac number, because 28356322505 - 2²⁰ = 28355273929 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 21761684 + ... + 21762986.

It is an arithmetic number, because the mean of its divisors is an integer number (1219354752).

Almost surely, 2^28356322505 is an apocalyptic number.

It is an amenable number.

28356322505 is a deficient number, since it is larger than the sum of its proper divisors (10663029559).

28356322505 is a wasteful number, since it uses less digits than its factorization.

28356322505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2925.

The product of its (nonzero) digits is 432000, while the sum is 41.

Adding to 28356322505 its reverse (50522365382), we get a palindrome (78878687887).

The spelling of 28356322505 in words is "twenty-eight billion, three hundred fifty-six million, three hundred twenty-two thousand, five hundred five".