28724339481 has 4 divisors (see below), whose sum is σ = 38299119312. Its totient is φ = 19149559652.

The previous prime is 28724339461. The next prime is 28724339503. The reversal of 28724339481 is 18493342782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28724339481 - 2⁶ = 28724339417 is a prime.

It is a super-2 number, since 2×28724339481² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28724339401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4787389911 + ... + 4787389916.

It is an arithmetic number, because the mean of its divisors is an integer number (9574779828).

Almost surely, 2^28724339481 is an apocalyptic number.

It is an amenable number.

28724339481 is a deficient number, since it is larger than the sum of its proper divisors (9574779831).

28724339481 is an equidigital number, since it uses as much as digits as its factorization.

28724339481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9574779830.

The product of its digits is 2322432, while the sum is 51.

The spelling of 28724339481 in words is "twenty-eight billion, seven hundred twenty-four million, three hundred thirty-nine thousand, four hundred eighty-one".