28655376291 has 16 divisors (see below), whose sum is σ = 42475101600. Its totient is φ = 19093372704.

The previous prime is 28655376283. The next prime is 28655376293. The reversal of 28655376291 is 19267355682.

28655376291 is a `hidden beast` number, since 2 + 8 + 6 + 5 + 5 + 3 + 7 + 629 + 1 = 666.

It is not a de Polignac number, because 28655376291 - 2³ = 28655376283 is a prime.

It is a super-2 number, since 2×28655376291² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28655376293) 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 15 ways as a sum of consecutive naturals, for example, 232036 + ... + 333393.

It is an arithmetic number, because the mean of its divisors is an integer number (2654693850).

Almost surely, 2^28655376291 is an apocalyptic number.

28655376291 is a deficient number, since it is larger than the sum of its proper divisors (13819725309).

28655376291 is a wasteful number, since it uses less digits than its factorization.

28655376291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 567315 (or 567309 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The spelling of 28655376291 in words is "twenty-eight billion, six hundred fifty-five million, three hundred seventy-six thousand, two hundred ninety-one".