128988724 has 12 divisors (see below), whose sum is σ = 239008644. Its totient is φ = 60700544.

The previous prime is 128988721. The next prime is 128988749. The reversal of 128988724 is 427889821.

It can be written as a sum of positive squares in 2 ways, for example, as 49956624 + 79032100 = 7068^2 + 8890^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128988721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 948379 + ... + 948514.

It is an arithmetic number, because the mean of its divisors is an integer number (19917387).

Almost surely, 2^128988724 is an apocalyptic number.

It is an amenable number.

128988724 is a deficient number, since it is larger than the sum of its proper divisors (110019920).

128988724 is a wasteful number, since it uses less digits than its factorization.

128988724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1896914 (or 1896912 counting only the distinct ones).

The product of its digits is 516096, while the sum is 49.

The square root of 128988724 is about 11357.3202825314. The cubic root of 128988724 is about 505.2627120481.

The spelling of 128988724 in words is "one hundred twenty-eight million, nine hundred eighty-eight thousand, seven hundred twenty-four".