128550685 has 8 divisors (see below), whose sum is σ = 163335096. Its totient is φ = 96791040.

The previous prime is 128550677. The next prime is 128550701. The reversal of 128550685 is 586055821.

It can be written as a sum of positive squares in 4 ways, for example, as 46049796 + 82500889 = 6786^2 + 9083^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128550685 - 2³ = 128550677 is a prime.

It is a super-2 number, since 2×128550685² = 33050557227938450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 756096 + ... + 756265.

It is an arithmetic number, because the mean of its divisors is an integer number (20416887).

Almost surely, 2^128550685 is an apocalyptic number.

It is an amenable number.

128550685 is a deficient number, since it is larger than the sum of its proper divisors (34784411).

128550685 is a wasteful number, since it uses less digits than its factorization.

128550685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1512383.

The product of its (nonzero) digits is 96000, while the sum is 40.

The square root of 128550685 is about 11338.0194478577. The cubic root of 128550685 is about 504.6901147548.

The spelling of 128550685 in words is "one hundred twenty-eight million, five hundred fifty thousand, six hundred eighty-five".