128221286 has 8 divisors (see below), whose sum is σ = 192396384. Its totient is φ = 64089160.

The previous prime is 128221283. The next prime is 128221307. The reversal of 128221286 is 682122821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128221283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1790 + ... + 16113.

It is an arithmetic number, because the mean of its divisors is an integer number (24049548).

Almost surely, 2^128221286 is an apocalyptic number.

128221286 is a deficient number, since it is larger than the sum of its proper divisors (64175098).

128221286 is a wasteful number, since it uses less digits than its factorization.

128221286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21486.

The product of its digits is 6144, while the sum is 32.

The square root of 128221286 is about 11323.4838278685. The cubic root of 128221286 is about 504.2586724361.

The spelling of 128221286 in words is "one hundred twenty-eight million, two hundred twenty-one thousand, two hundred eighty-six".