128946636 has 108 divisors (see below), whose sum is σ = 408403632. Its totient is φ = 34001856.

The previous prime is 128946617. The next prime is 128946641. The reversal of 128946636 is 636649821.

128946636 is a `hidden beast` number, since 1 + 2 + 8 + 9 + 4 + 6 + 636 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 128946591 and 128946600.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 20121 + ... + 25743.

Almost surely, 2^128946636 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 128946636, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204201816).

128946636 is an abundant number, since it is smaller than the sum of its proper divisors (279456996).

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

128946636 is a wasteful number, since it uses less digits than its factorization.

128946636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5660 (or 5648 counting only the distinct ones).

The product of its digits is 373248, while the sum is 45.

The square root of 128946636 is about 11355.4672294891. The cubic root of 128946636 is about 505.2077516616.

The spelling of 128946636 in words is "one hundred twenty-eight million, nine hundred forty-six thousand, six hundred thirty-six".