128961652 has 12 divisors (see below), whose sum is σ = 225765540. Its totient is φ = 64457216.

The previous prime is 128961647. The next prime is 128961659. The reversal of 128961652 is 256169821.

It can be written as a sum of positive squares in 2 ways, for example, as 121088016 + 7873636 = 11004^2 + 2806^2 .

It is a super-2 number, since 2×128961652² = 33262215373138208, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128961659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13398 + ... + 20914.

It is an arithmetic number, because the mean of its divisors is an integer number (18813795).

Almost surely, 2^128961652 is an apocalyptic number.

It is an amenable number.

128961652 is a deficient number, since it is larger than the sum of its proper divisors (96803888).

128961652 is a wasteful number, since it uses less digits than its factorization.

128961652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11810 (or 11808 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 128961652 is about 11356.1283895525. The cubic root of 128961652 is about 505.2273615958.

The spelling of 128961652 in words is "one hundred twenty-eight million, nine hundred sixty-one thousand, six hundred fifty-two".