128556036 has 72 divisors (see below), whose sum is σ = 377517504. Its totient is φ = 36123840.

The previous prime is 128556013. The next prime is 128556047. The reversal of 128556036 is 630655821.

128556036 is a `hidden beast` number, since 12 + 85 + 560 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11191 + ... + 19553.

Almost surely, 2^128556036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128556036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (188758752).

128556036 is an abundant number, since it is smaller than the sum of its proper divisors (248961468).

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

128556036 is a wasteful number, since it uses less digits than its factorization.

128556036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8441 (or 8436 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 128556036 is about 11338.2554213600. The cubic root of 128556036 is about 504.6971173347.

The spelling of 128556036 in words is "one hundred twenty-eight million, five hundred fifty-six thousand, thirty-six".