28060637721 has 16 divisors (see below), whose sum is σ = 39115585536. Its totient is φ = 17859503376.

The previous prime is 28060637641. The next prime is 28060637779. The reversal of 28060637721 is 12773606082.

It is not a de Polignac number, because 28060637721 - 2¹³ = 28060629529 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28060637321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 352705 + ... + 424878.

It is an arithmetic number, because the mean of its divisors is an integer number (2444724096).

Almost surely, 2^28060637721 is an apocalyptic number.

It is an amenable number.

28060637721 is a deficient number, since it is larger than the sum of its proper divisors (11054947815).

28060637721 is a wasteful number, since it uses less digits than its factorization.

28060637721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778132.

The product of its (nonzero) digits is 169344, while the sum is 42.

The spelling of 28060637721 in words is "twenty-eight billion, sixty million, six hundred thirty-seven thousand, seven hundred twenty-one".