128213885 has 16 divisors (see below), whose sum is σ = 158685696. Its totient is φ = 99395328.

The previous prime is 128213879. The next prime is 128213963. The reversal of 128213885 is 588312821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 128213885 - 2⁶ = 128213821 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21557 + ... + 26853.

It is an arithmetic number, because the mean of its divisors is an integer number (9917856).

Almost surely, 2^128213885 is an apocalyptic number.

It is an amenable number.

128213885 is a deficient number, since it is larger than the sum of its proper divisors (30471811).

128213885 is a wasteful number, since it uses less digits than its factorization.

128213885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5452.

The product of its digits is 30720, while the sum is 38.

The square root of 128213885 is about 11323.1570244345. The cubic root of 128213885 is about 504.2489702243.

The spelling of 128213885 in words is "one hundred twenty-eight million, two hundred thirteen thousand, eight hundred eighty-five".