28311690241 has 4 divisors (see below), whose sum is σ = 28313826372. Its totient is φ = 28309554112.

The previous prime is 28311690181. The next prime is 28311690257. The reversal of 28311690241 is 14209611382.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14209611382 = 2 ⋅7104805691.

It can be written as a sum of positive squares in 2 ways, for example, as 13312544400 + 14999145841 = 115380^2 + 122471^2 .

It is a cyclic number.

It is not a de Polignac number, because 28311690241 - 2¹¹ = 28311688193 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 28311690241.

It is not an unprimeable number, because it can be changed into a prime (28311630241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1048060 + ... + 1074733.

It is an arithmetic number, because the mean of its divisors is an integer number (7078456593).

Almost surely, 2^28311690241 is an apocalyptic number.

It is an amenable number.

28311690241 is a deficient number, since it is larger than the sum of its proper divisors (2136131).

28311690241 is a wasteful number, since it uses less digits than its factorization.

28311690241 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136130.

The product of its (nonzero) digits is 20736, while the sum is 37.

The spelling of 28311690241 in words is "twenty-eight billion, three hundred eleven million, six hundred ninety thousand, two hundred forty-one".