28261082615 has 4 divisors (see below), whose sum is σ = 33913299144. Its totient is φ = 22608866088.

The previous prime is 28261082611. The next prime is 28261082627. The reversal of 28261082615 is 51628016282.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 51628016282 = 2 ⋅25814008141.

It is a cyclic number.

It is not a de Polignac number, because 28261082615 - 2² = 28261082611 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28261082611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2826108257 + ... + 2826108266.

It is an arithmetic number, because the mean of its divisors is an integer number (8478324786).

Almost surely, 2^28261082615 is an apocalyptic number.

28261082615 is a deficient number, since it is larger than the sum of its proper divisors (5652216529).

28261082615 is an equidigital number, since it uses as much as digits as its factorization.

28261082615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5652216528.

The product of its (nonzero) digits is 92160, while the sum is 41.

Adding to 28261082615 its reverse (51628016282), we get a palindrome (79889098897).

The spelling of 28261082615 in words is "twenty-eight billion, two hundred sixty-one million, eighty-two thousand, six hundred fifteen".