128822671 has 4 divisors (see below), whose sum is σ = 129375792. Its totient is φ = 128269552.

The previous prime is 128822653. The next prime is 128822713. The reversal of 128822671 is 176228821.

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 128822671 - 2¹¹ = 128820623 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128822671.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128822621) 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, 276211 + ... + 276676.

It is an arithmetic number, because the mean of its divisors is an integer number (32343948).

Almost surely, 2^128822671 is an apocalyptic number.

128822671 is a deficient number, since it is larger than the sum of its proper divisors (553121).

128822671 is an equidigital number, since it uses as much as digits as its factorization.

128822671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553120.

The product of its digits is 21504, while the sum is 37.

The square root of 128822671 is about 11350.0075330371. The cubic root of 128822671 is about 505.0458031194.

The spelling of 128822671 in words is "one hundred twenty-eight million, eight hundred twenty-two thousand, six hundred seventy-one".