28119719405 has 4 divisors (see below), whose sum is σ = 33743663292. Its totient is φ = 22495775520.

The previous prime is 28119719399. The next prime is 28119719443. The reversal of 28119719405 is 50491791182.

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 4144913161 + 23974806244 = 64381^2 + 154838^2 .

It is not a de Polignac number, because 28119719405 - 2¹⁰ = 28119718381 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28119719405.

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, 2811971936 + ... + 2811971945.

It is an arithmetic number, because the mean of its divisors is an integer number (8435915823).

Almost surely, 2^28119719405 is an apocalyptic number.

It is an amenable number.

28119719405 is a deficient number, since it is larger than the sum of its proper divisors (5623943887).

28119719405 is an equidigital number, since it uses as much as digits as its factorization.

28119719405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5623943886.

The product of its (nonzero) digits is 181440, while the sum is 47.

The spelling of 28119719405 in words is "twenty-eight billion, one hundred nineteen million, seven hundred nineteen thousand, four hundred five".