28338754991 has 2 divisors, whose sum is σ = 28338754992. Its totient is φ = 28338754990.

The previous prime is 28338754949. The next prime is 28338755041. The reversal of 28338754991 is 19945783382.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28338754991 - 2²² = 28334560687 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28338754991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28338754091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14169377495 + 14169377496.

It is an arithmetic number, because the mean of its divisors is an integer number (14169377496).

Almost surely, 2^28338754991 is an apocalyptic number.

28338754991 is a deficient number, since it is larger than the sum of its proper divisors (1).

28338754991 is an equidigital number, since it uses as much as digits as its factorization.

28338754991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 59.

The spelling of 28338754991 in words is "twenty-eight billion, three hundred thirty-eight million, seven hundred fifty-four thousand, nine hundred ninety-one".