28107874765 has 4 divisors (see below), whose sum is σ = 33729449724. Its totient is φ = 22486299808.

The previous prime is 28107874759. The next prime is 28107874793. The reversal of 28107874765 is 56747870182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56747870182 = 2 ⋅28373935091.

It can be written as a sum of positive squares in 2 ways, for example, as 20406408201 + 7701466564 = 142851^2 + 87758^2 .

It is a cyclic number.

It is not a de Polignac number, because 28107874765 - 2⁵ = 28107874733 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2810787472 + ... + 2810787481.

It is an arithmetic number, because the mean of its divisors is an integer number (8432362431).

Almost surely, 2^28107874765 is an apocalyptic number.

It is an amenable number.

28107874765 is a deficient number, since it is larger than the sum of its proper divisors (5621574959).

28107874765 is an equidigital number, since it uses as much as digits as its factorization.

28107874765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5621574958.

The product of its (nonzero) digits is 5268480, while the sum is 55.

The spelling of 28107874765 in words is "twenty-eight billion, one hundred seven million, eight hundred seventy-four thousand, seven hundred sixty-five".