128861236 has 12 divisors (see below), whose sum is σ = 257722528. Its totient is φ = 55226232.

The previous prime is 128861221. The next prime is 128861303. The reversal of 128861236 is 632168821.

It is a happy number.

128861236 is an admirable number.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 128861195 and 128861204.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2301066 + ... + 2301121.

Almost surely, 2^128861236 is an apocalyptic number.

It is an amenable number.

128861236 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

128861236 is a wasteful number, since it uses less digits than its factorization.

128861236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4602198 (or 4602196 counting only the distinct ones).

The product of its digits is 27648, while the sum is 37.

The square root of 128861236 is about 11351.7063034594. The cubic root of 128861236 is about 505.0961957715.

The spelling of 128861236 in words is "one hundred twenty-eight million, eight hundred sixty-one thousand, two hundred thirty-six".