28381078291 has 2 divisors, whose sum is σ = 28381078292. Its totient is φ = 28381078290.

The previous prime is 28381078249. The next prime is 28381078331. The reversal of 28381078291 is 19287018382.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28381078291 - 2¹⁷ = 28380947219 is a prime.

It is not a weakly prime, because it can be changed into another prime (28381078211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14190539145 + 14190539146.

It is an arithmetic number, because the mean of its divisors is an integer number (14190539146).

Almost surely, 2^28381078291 is an apocalyptic number.

28381078291 is a deficient number, since it is larger than the sum of its proper divisors (1).

28381078291 is an equidigital number, since it uses as much as digits as its factorization.

28381078291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 49.

The spelling of 28381078291 in words is "twenty-eight billion, three hundred eighty-one million, seventy-eight thousand, two hundred ninety-one".