128922863 has 4 divisors (see below), whose sum is σ = 129413328. Its totient is φ = 128432400.

The previous prime is 128922841. The next prime is 128922877. The reversal of 128922863 is 368229821.

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 128922863 - 2²⁴ = 112145647 is a prime.

It is a super-2 number, since 2×128922863² = 33242209208233538, which contains 22 as substring.

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 128922863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128982863) 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, 244838 + ... + 245363.

It is an arithmetic number, because the mean of its divisors is an integer number (32353332).

Almost surely, 2^128922863 is an apocalyptic number.

128922863 is a deficient number, since it is larger than the sum of its proper divisors (490465).

128922863 is an equidigital number, since it uses as much as digits as its factorization.

128922863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490464.

The product of its digits is 82944, while the sum is 41.

The square root of 128922863 is about 11354.4204167364. The cubic root of 128922863 is about 505.1767025330.

The spelling of 128922863 in words is "one hundred twenty-eight million, nine hundred twenty-two thousand, eight hundred sixty-three".