28397824491 has 16 divisors (see below), whose sum is σ = 38302493984. Its totient is φ = 18713769984.

The previous prime is 28397824447. The next prime is 28397824589. The reversal of 28397824491 is 19442879382.

It is not a de Polignac number, because 28397824491 - 2¹¹ = 28397822443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28397824891) 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 15 ways as a sum of consecutive naturals, for example, 65296 + ... + 247101.

It is an arithmetic number, because the mean of its divisors is an integer number (2393905874).

Almost surely, 2^28397824491 is an apocalyptic number.

28397824491 is a deficient number, since it is larger than the sum of its proper divisors (9904669493).

28397824491 is a wasteful number, since it uses less digits than its factorization.

28397824491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 312750.

The product of its digits is 6967296, while the sum is 57.

The spelling of 28397824491 in words is "twenty-eight billion, three hundred ninety-seven million, eight hundred twenty-four thousand, four hundred ninety-one".