128912222 has 4 divisors (see below), whose sum is σ = 193368336. Its totient is φ = 64456110.

The previous prime is 128912213. The next prime is 128912243. The reversal of 128912222 is 222219821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32228054 + ... + 32228057.

It is an arithmetic number, because the mean of its divisors is an integer number (48342084).

Almost surely, 2^128912222 is an apocalyptic number.

128912222 is a deficient number, since it is larger than the sum of its proper divisors (64456114).

128912222 is an equidigital number, since it uses as much as digits as its factorization.

128912222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64456113.

The product of its digits is 2304, while the sum is 29.

The square root of 128912222 is about 11353.9518230438. The cubic root of 128912222 is about 505.1628034384.

The spelling of 128912222 in words is "one hundred twenty-eight million, nine hundred twelve thousand, two hundred twenty-two".