28381591329 has 64 divisors (see below), whose sum is σ = 47591620608. Its totient is φ = 14646355200.

The previous prime is 28381591309. The next prime is 28381591349. The reversal of 28381591329 is 92319518382.

It is an interprime number because it is at equal distance from previous prime (28381591309) and next prime (28381591349).

It is not a de Polignac number, because 28381591329 - 2⁷ = 28381591201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28381591309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3176262 + ... + 3185184.

It is an arithmetic number, because the mean of its divisors is an integer number (743619072).

Almost surely, 2^28381591329 is an apocalyptic number.

It is an amenable number.

28381591329 is a deficient number, since it is larger than the sum of its proper divisors (19210029279).

28381591329 is a wasteful number, since it uses less digits than its factorization.

28381591329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9198.

The product of its digits is 933120, while the sum is 51.

The spelling of 28381591329 in words is "twenty-eight billion, three hundred eighty-one million, five hundred ninety-one thousand, three hundred twenty-nine".