28791540261 has 64 divisors (see below), whose sum is σ = 47664599040. Its totient is φ = 17026859520.

The previous prime is 28791540259. The next prime is 28791540263. The reversal of 28791540261 is 16204519782.

28791540261 is a `hidden beast` number, since 2 + 87 + 9 + 1 + 540 + 26 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (28791540259) and next prime (28791540263).

It is not a de Polignac number, because 28791540261 - 2¹ = 28791540259 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28791540263) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4924606 + ... + 4930448.

It is an arithmetic number, because the mean of its divisors is an integer number (744759360).

Almost surely, 2^28791540261 is an apocalyptic number.

It is an amenable number.

28791540261 is a deficient number, since it is larger than the sum of its proper divisors (18873058779).

28791540261 is a wasteful number, since it uses less digits than its factorization.

28791540261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6263 (or 6257 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 28791540261 in words is "twenty-eight billion, seven hundred ninety-one million, five hundred forty thousand, two hundred sixty-one".