28468280261 has 4 divisors (see below), whose sum is σ = 28750144524. Its totient is φ = 28186416000.

The previous prime is 28468280231. The next prime is 28468280293. The reversal of 28468280261 is 16208286482.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13090792225 + 15377488036 = 114415^2 + 124006^2 .

It is a cyclic number.

It is not a de Polignac number, because 28468280261 - 2²² = 28464085957 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 (28468280221) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140931980 + ... + 140932181.

It is an arithmetic number, because the mean of its divisors is an integer number (7187536131).

Almost surely, 2^28468280261 is an apocalyptic number.

It is an amenable number.

28468280261 is a deficient number, since it is larger than the sum of its proper divisors (281864263).

28468280261 is a wasteful number, since it uses less digits than its factorization.

28468280261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281864262.

The product of its (nonzero) digits is 589824, while the sum is 47.

The spelling of 28468280261 in words is "twenty-eight billion, four hundred sixty-eight million, two hundred eighty thousand, two hundred sixty-one".