28158276257 has 4 divisors (see below), whose sum is σ = 28158993840. Its totient is φ = 28157558676.

The previous prime is 28158276233. The next prime is 28158276271. The reversal of 28158276257 is 75267285182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28158276257 - 2¹⁶ = 28158210721 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28158276199 and 28158276208.

It is not an unprimeable number, because it can be changed into a prime (28158276557) by changing a digit.

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, 296303 + ... + 379620.

It is an arithmetic number, because the mean of its divisors is an integer number (7039748460).

Almost surely, 2^28158276257 is an apocalyptic number.

It is an amenable number.

28158276257 is a deficient number, since it is larger than the sum of its proper divisors (717583).

28158276257 is an equidigital number, since it uses as much as digits as its factorization.

28158276257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 717582.

The product of its digits is 3763200, while the sum is 53.

The spelling of 28158276257 in words is "twenty-eight billion, one hundred fifty-eight million, two hundred seventy-six thousand, two hundred fifty-seven".