28126721519 has 8 divisors (see below), whose sum is σ = 30420320112. Its totient is φ = 25851695040.

The previous prime is 28126721503. The next prime is 28126721533. The reversal of 28126721519 is 91512762182.

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 28126721519 - 2⁴ = 28126721503 is a prime.

It is a super-2 number, since 2×28126721519² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28126721519.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28126721719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4639877 + ... + 4645934.

It is an arithmetic number, because the mean of its divisors is an integer number (3802540014).

Almost surely, 2^28126721519 is an apocalyptic number.

28126721519 is a deficient number, since it is larger than the sum of its proper divisors (2293598593).

28126721519 is a wasteful number, since it uses less digits than its factorization.

28126721519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9286057.

The product of its digits is 120960, while the sum is 44.

The spelling of 28126721519 in words is "twenty-eight billion, one hundred twenty-six million, seven hundred twenty-one thousand, five hundred nineteen".