28397489729 has 8 divisors (see below), whose sum is σ = 33066619200. Its totient is φ = 23881446576.

The previous prime is 28397489719. The next prime is 28397489753. The reversal of 28397489729 is 92798479382.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28397489729 - 2¹⁶ = 28397424193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28397489719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38271179 + ... + 38271920.

It is an arithmetic number, because the mean of its divisors is an integer number (4133327400).

Almost surely, 2^28397489729 is an apocalyptic number.

It is an amenable number.

28397489729 is a deficient number, since it is larger than the sum of its proper divisors (4669129471).

28397489729 is an equidigital number, since it uses as much as digits as its factorization.

28397489729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76543159.

The product of its digits is 109734912, while the sum is 68.

The spelling of 28397489729 in words is "twenty-eight billion, three hundred ninety-seven million, four hundred eighty-nine thousand, seven hundred twenty-nine".