28146778735 has 4 divisors (see below), whose sum is σ = 33776134488. Its totient is φ = 22517422984.

The previous prime is 28146778727. The next prime is 28146778757. The reversal of 28146778735 is 53787764182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 53787764182 = 2 ⋅26893882091.

It is a cyclic number.

It is not a de Polignac number, because 28146778735 - 2³ = 28146778727 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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 28146778735.

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, 2814677869 + ... + 2814677878.

It is an arithmetic number, because the mean of its divisors is an integer number (8444033622).

Almost surely, 2^28146778735 is an apocalyptic number.

28146778735 is a deficient number, since it is larger than the sum of its proper divisors (5629355753).

28146778735 is an equidigital number, since it uses as much as digits as its factorization.

28146778735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5629355752.

The product of its digits is 15805440, while the sum is 58.

The spelling of 28146778735 in words is "twenty-eight billion, one hundred forty-six million, seven hundred seventy-eight thousand, seven hundred thirty-five".