128215228 has 6 divisors (see below), whose sum is σ = 224376656. Its totient is φ = 64107612.

The previous prime is 128215223. The next prime is 128215231. The reversal of 128215228 is 822512821.

It is a self number, because there is not a number n which added to its sum of digits gives 128215228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128215223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16026900 + ... + 16026907.

Almost surely, 2^128215228 is an apocalyptic number.

It is an amenable number.

128215228 is a deficient number, since it is larger than the sum of its proper divisors (96161428).

128215228 is a wasteful number, since it uses less digits than its factorization.

128215228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32053811 (or 32053809 counting only the distinct ones).

The product of its digits is 5120, while the sum is 31.

The square root of 128215228 is about 11323.2163275281. The cubic root of 128215228 is about 504.2507308344.

The spelling of 128215228 in words is "one hundred twenty-eight million, two hundred fifteen thousand, two hundred twenty-eight".