128225436 has 12 divisors (see below), whose sum is σ = 299192712. Its totient is φ = 42741808.

The previous prime is 128225429. The next prime is 128225521. The reversal of 128225436 is 634522821.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 128225397 and 128225406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5342715 + ... + 5342738.

It is an arithmetic number, because the mean of its divisors is an integer number (24932726).

Almost surely, 2^128225436 is an apocalyptic number.

It is an amenable number.

128225436 is an abundant number, since it is smaller than the sum of its proper divisors (170967276).

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

128225436 is a wasteful number, since it uses less digits than its factorization.

128225436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10685460 (or 10685458 counting only the distinct ones).

The product of its digits is 23040, while the sum is 33.

The square root of 128225436 is about 11323.6670738767. The cubic root of 128225436 is about 504.2641126429.

The spelling of 128225436 in words is "one hundred twenty-eight million, two hundred twenty-five thousand, four hundred thirty-six".