28711070681 has 4 divisors (see below), whose sum is σ = 29139594192. Its totient is φ = 28282547172.

The previous prime is 28711070669. The next prime is 28711070719. The reversal of 28711070681 is 18607011782.

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 28711070681 - 2¹⁸ = 28710808537 is a prime.

It is a super-2 number, since 2×28711070681² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28711070281) 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, 214261655 + ... + 214261788.

It is an arithmetic number, because the mean of its divisors is an integer number (7284898548).

Almost surely, 2^28711070681 is an apocalyptic number.

It is an amenable number.

28711070681 is a deficient number, since it is larger than the sum of its proper divisors (428523511).

28711070681 is an equidigital number, since it uses as much as digits as its factorization.

28711070681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428523510.

The product of its (nonzero) digits is 37632, while the sum is 41.

The spelling of 28711070681 in words is "twenty-eight billion, seven hundred eleven million, seventy thousand, six hundred eighty-one".