28710897211 has 4 divisors (see below), whose sum is σ = 28711537992. Its totient is φ = 28710256432.

The previous prime is 28710897197. The next prime is 28710897227. The reversal of 28710897211 is 11279801782.

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

It is a cyclic number.

It is not a de Polignac number, because 28710897211 - 2⁵ = 28710897179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28710898211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 247681 + ... + 344626.

It is an arithmetic number, because the mean of its divisors is an integer number (7177884498).

Almost surely, 2^28710897211 is an apocalyptic number.

28710897211 is a deficient number, since it is larger than the sum of its proper divisors (640781).

28710897211 is an equidigital number, since it uses as much as digits as its factorization.

28710897211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 640780.

The product of its (nonzero) digits is 112896, while the sum is 46.

The spelling of 28710897211 in words is "twenty-eight billion, seven hundred ten million, eight hundred ninety-seven thousand, two hundred eleven".