128224989 has 24 divisors (see below), whose sum is σ = 189106944. Its totient is φ = 83700000.

The previous prime is 128224981. The next prime is 128224991. The reversal of 128224989 is 989422821.

It is a happy number.

It is not a de Polignac number, because 128224989 - 2³ = 128224981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128224981) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 170364 + ... + 171114.

It is an arithmetic number, because the mean of its divisors is an integer number (7879456).

Almost surely, 2^128224989 is an apocalyptic number.

It is an amenable number.

128224989 is a deficient number, since it is larger than the sum of its proper divisors (60881955).

128224989 is a wasteful number, since it uses less digits than its factorization.

128224989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1129 (or 1126 counting only the distinct ones).

The product of its digits is 165888, while the sum is 45.

The square root of 128224989 is about 11323.6473364371. The cubic root of 128224989 is about 504.2635266793.

The spelling of 128224989 in words is "one hundred twenty-eight million, two hundred twenty-four thousand, nine hundred eighty-nine".