28374728705 has 4 divisors (see below), whose sum is σ = 34049674452. Its totient is φ = 22699782960.

The previous prime is 28374728677. The next prime is 28374728731. The reversal of 28374728705 is 50782747382.

It is a Cunningham number, because it is equal to 168448²+1.

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 10214740624 + 18159988081 = 101068^2 + 134759^2 .

It is not a de Polignac number, because 28374728705 - 2⁸ = 28374728449 is a prime.

It is a Duffinian number.

It is a Curzon 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, 2837472866 + ... + 2837472875.

It is an arithmetic number, because the mean of its divisors is an integer number (8512418613).

It is a Proth number, since it is equal to 108241 ⋅ 2¹⁸ + 1 and 108241 < 2¹⁸.

Almost surely, 2^28374728705 is an apocalyptic number.

It is an amenable number.

28374728705 is a deficient number, since it is larger than the sum of its proper divisors (5674945747).

28374728705 is an equidigital number, since it uses as much as digits as its factorization.

28374728705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5674945746.

The product of its (nonzero) digits is 5268480, while the sum is 53.

The spelling of 28374728705 in words is "twenty-eight billion, three hundred seventy-four million, seven hundred twenty-eight thousand, seven hundred five".