28838372261 has 4 divisors (see below), whose sum is σ = 29311132524. Its totient is φ = 28365612000.

The previous prime is 28838372203. The next prime is 28838372293. The reversal of 28838372261 is 16227383882.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 16227383882 = 2 ⋅8113691941.

It can be written as a sum of positive squares in 2 ways, for example, as 759002500 + 28079369761 = 27550^2 + 167569^2 .

It is a cyclic number.

It is not a de Polignac number, because 28838372261 - 2³⁰ = 27764630437 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 (28838302261) 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, 236380040 + ... + 236380161.

It is an arithmetic number, because the mean of its divisors is an integer number (7327783131).

Almost surely, 2^28838372261 is an apocalyptic number.

It is an amenable number.

28838372261 is a deficient number, since it is larger than the sum of its proper divisors (472760263).

28838372261 is an equidigital number, since it uses as much as digits as its factorization.

28838372261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 472760262.

The product of its digits is 1548288, while the sum is 50.

The spelling of 28838372261 in words is "twenty-eight billion, eight hundred thirty-eight million, three hundred seventy-two thousand, two hundred sixty-one".