28891722239 has 2 divisors, whose sum is σ = 28891722240. Its totient is φ = 28891722238.

The previous prime is 28891722199. The next prime is 28891722253. The reversal of 28891722239 is 93222719882.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28891722239 - 2³² = 24596754943 is a prime.

It is a super-2 number, since 2×28891722239² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28891782239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14445861119 + 14445861120.

It is an arithmetic number, because the mean of its divisors is an integer number (14445861120).

Almost surely, 2^28891722239 is an apocalyptic number.

28891722239 is a deficient number, since it is larger than the sum of its proper divisors (1).

28891722239 is an equidigital number, since it uses as much as digits as its factorization.

28891722239 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1741824, while the sum is 53.

The spelling of 28891722239 in words is "twenty-eight billion, eight hundred ninety-one million, seven hundred twenty-two thousand, two hundred thirty-nine".