28772744062721 has 4 divisors (see below), whose sum is σ = 28836825898500. Its totient is φ = 28708662226944.

The previous prime is 28772744062687. The next prime is 28772744062757. The reversal of 28772744062721 is 12726044727782.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 24900648903025 + 3872095159696 = 4990055^2 + 1967764^2 .

It is a cyclic number.

It is not a de Polignac number, because 28772744062721 - 2¹⁴ = 28772744046337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28772744062781) 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 3 ways as a sum of consecutive naturals, for example, 32040917216 + ... + 32040918113.

It is an arithmetic number, because the mean of its divisors is an integer number (7209206474625).

Almost surely, 2^{28772744062721} is an apocalyptic number.

It is an amenable number.

28772744062721 is a deficient number, since it is larger than the sum of its proper divisors (64081835779).

28772744062721 is an equidigital number, since it uses as much as digits as its factorization.

28772744062721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64081835778.

The product of its (nonzero) digits is 29503488, while the sum is 59.

The spelling of 28772744062721 in words is "twenty-eight trillion, seven hundred seventy-two billion, seven hundred forty-four million, sixty-two thousand, seven hundred twenty-one".