128387252 has 18 divisors (see below), whose sum is σ = 261360162. Its totient is φ = 55023024.

The previous prime is 128387251. The next prime is 128387257. The reversal of 128387252 is 252783821.

It can be written as a sum of positive squares in only one way, i.e., 105596176 + 22791076 = 10276^2 + 4774^2 .

It is a super-2 number, since 2×128387252² = 32966572952223008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128387251) 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 5 ways as a sum of consecutive naturals, for example, 327323 + ... + 327714.

It is an arithmetic number, because the mean of its divisors is an integer number (14520009).

Almost surely, 2^128387252 is an apocalyptic number.

It is an amenable number.

128387252 is an abundant number, since it is smaller than the sum of its proper divisors (132972910).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128387252 is a wasteful number, since it uses less digits than its factorization.

128387252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655055 (or 655046 counting only the distinct ones).

The product of its digits is 53760, while the sum is 38.

The square root of 128387252 is about 11330.8098563165. The cubic root of 128387252 is about 504.4761446797.

The spelling of 128387252 in words is "one hundred twenty-eight million, three hundred eighty-seven thousand, two hundred fifty-two".