28110772405 has 4 divisors (see below), whose sum is σ = 33732926892. Its totient is φ = 22488617920.

The previous prime is 28110772381. The next prime is 28110772421. The reversal of 28110772405 is 50427701182.

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 20095330564 + 8015441841 = 141758^2 + 89529^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28110772405 is a prime.

It is a Duffinian number.

It is a congruent 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, 2811077236 + ... + 2811077245.

It is an arithmetic number, because the mean of its divisors is an integer number (8433231723).

Almost surely, 2^28110772405 is an apocalyptic number.

It is an amenable number.

28110772405 is a deficient number, since it is larger than the sum of its proper divisors (5622154487).

28110772405 is an equidigital number, since it uses as much as digits as its factorization.

28110772405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5622154486.

The product of its (nonzero) digits is 31360, while the sum is 37.

The spelling of 28110772405 in words is "twenty-eight billion, one hundred ten million, seven hundred seventy-two thousand, four hundred five".