28724748137 has 4 divisors (see below), whose sum is σ = 28727015040. Its totient is φ = 28722481236.

The previous prime is 28724748127. The next prime is 28724748163. The reversal of 28724748137 is 73184742782.

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 a de Polignac number, because none of the positive numbers 2^k-28724748137 is a prime.

It is a super-3 number, since 3×28724748137³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28724748127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1114337 + ... + 1139822.

It is an arithmetic number, because the mean of its divisors is an integer number (7181753760).

Almost surely, 2^28724748137 is an apocalyptic number.

It is an amenable number.

28724748137 is a deficient number, since it is larger than the sum of its proper divisors (2266903).

28724748137 is a wasteful number, since it uses less digits than its factorization.

28724748137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2266902.

The product of its digits is 4214784, while the sum is 53.

The spelling of 28724748137 in words is "twenty-eight billion, seven hundred twenty-four million, seven hundred forty-eight thousand, one hundred thirty-seven".