128213436 has 96 divisors (see below), whose sum is σ = 335755840. Its totient is φ = 37822464.

The previous prime is 128213429. The next prime is 128213447. The reversal of 128213436 is 634312821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 559770 + ... + 559998.

Almost surely, 2^128213436 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 128213436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167877920).

128213436 is an abundant number, since it is smaller than the sum of its proper divisors (207542404).

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

128213436 is a wasteful number, since it uses less digits than its factorization.

128213436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 383 (or 381 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 128213436 is about 11323.1371977911. The cubic root of 128213436 is about 504.2483816036.

The spelling of 128213436 in words is "one hundred twenty-eight million, two hundred thirteen thousand, four hundred thirty-six".