128722870247 has 4 divisors (see below), whose sum is σ = 128809437216. Its totient is φ = 128636303280.

The previous prime is 128722870139. The next prime is 128722870273. The reversal of 128722870247 is 742078227821.

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 128722870247 - 2⁸ = 128722869991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 128722870195 and 128722870204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128722870277) 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, 43281254 + ... + 43284227.

It is an arithmetic number, because the mean of its divisors is an integer number (32202359304).

Almost surely, 2^128722870247 is an apocalyptic number.

128722870247 is a deficient number, since it is larger than the sum of its proper divisors (86566969).

128722870247 is an equidigital number, since it uses as much as digits as its factorization.

128722870247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86566968.

The product of its (nonzero) digits is 1404928, while the sum is 50.

The spelling of 128722870247 in words is "one hundred twenty-eight billion, seven hundred twenty-two million, eight hundred seventy thousand, two hundred forty-seven".