128381562 has 12 divisors (see below), whose sum is σ = 278160090. Its totient is φ = 42793848.

The previous prime is 128381549. The next prime is 128381563. The reversal of 128381562 is 265183821.

It is a happy number.

128381562 is a `hidden beast` number, since 12 + 8 + 3 + 81 + 562 = 666.

It can be written as a sum of positive squares in only one way, i.e., 118135161 + 10246401 = 10869^2 + 3201^2 .

It is not an unprimeable number, because it can be changed into a prime (128381563) 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 5 ways as a sum of consecutive naturals, for example, 3566137 + ... + 3566172.

Almost surely, 2^128381562 is an apocalyptic number.

128381562 is an abundant number, since it is smaller than the sum of its proper divisors (149778528).

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

128381562 is a wasteful number, since it uses less digits than its factorization.

128381562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7132317 (or 7132314 counting only the distinct ones).

The product of its digits is 23040, while the sum is 36.

The square root of 128381562 is about 11330.5587682162. The cubic root of 128381562 is about 504.4686919364.

It can be divided in two parts, 12838 and 1562, that added together give a square (14400 = 120²).

The spelling of 128381562 in words is "one hundred twenty-eight million, three hundred eighty-one thousand, five hundred sixty-two".