28381078331 has 2 divisors, whose sum is σ = 28381078332. Its totient is φ = 28381078330.

The previous prime is 28381078291. The next prime is 28381078333. The reversal of 28381078331 is 13387018382.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28381078331 is a prime.

It is a super-2 number, since 2×28381078331² (a number of 22 digits) contains 22 as substring.

Together with 28381078333, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (28381078333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14190539165 + 14190539166.

It is an arithmetic number, because the mean of its divisors is an integer number (14190539166).

Almost surely, 2^28381078331 is an apocalyptic number.

28381078331 is a deficient number, since it is larger than the sum of its proper divisors (1).

28381078331 is an equidigital number, since it uses as much as digits as its factorization.

28381078331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 193536, while the sum is 44.

The spelling of 28381078331 in words is "twenty-eight billion, three hundred eighty-one million, seventy-eight thousand, three hundred thirty-one".