128536840 has 16 divisors (see below), whose sum is σ = 289207980. Its totient is φ = 51414720.

The previous prime is 128536817. The next prime is 128536861. The reversal of 128536840 is 48635821.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 128459556 + 77284 = 11334^2 + 278^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 128536840.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1606671 + ... + 1606750.

Almost surely, 2^128536840 is an apocalyptic number.

128536840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128536840 is an abundant number, since it is smaller than the sum of its proper divisors (160671140).

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

128536840 is a wasteful number, since it uses less digits than its factorization.

128536840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3213432 (or 3213428 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 37.

The square root of 128536840 is about 11337.4088750472. The cubic root of 128536840 is about 504.6719956098.

The spelling of 128536840 in words is "one hundred twenty-eight million, five hundred thirty-six thousand, eight hundred forty".