128916220 has 12 divisors (see below), whose sum is σ = 270724104. Its totient is φ = 51566480.

The previous prime is 128916187. The next prime is 128916247. The reversal of 128916220 is 22619821.

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, 3222886 + ... + 3222925.

It is an arithmetic number, because the mean of its divisors is an integer number (22560342).

Almost surely, 2^128916220 is an apocalyptic number.

128916220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128916220 is an abundant number, since it is smaller than the sum of its proper divisors (141807884).

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

128916220 is a wasteful number, since it uses less digits than its factorization.

128916220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6445820 (or 6445818 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 128916220 is about 11354.1278837258. The cubic root of 128916220 is about 505.1680256483.

The spelling of 128916220 in words is "one hundred twenty-eight million, nine hundred sixteen thousand, two hundred twenty".