1220128055 has 8 divisors (see below), whose sum is σ = 1471820544. Its totient is φ = 970991200.

The previous prime is 1220128043. The next prime is 1220128069. The reversal of 1220128055 is 5508210221.

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

It is not a de Polignac number, because 1220128055 - 2²² = 1215933751 is a prime.

It is a Duffinian number.

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 in 7 ways as a sum of consecutive naturals, for example, 637856 + ... + 639765.

It is an arithmetic number, because the mean of its divisors is an integer number (183977568).

Almost surely, 2^1220128055 is an apocalyptic number.

1220128055 is a deficient number, since it is larger than the sum of its proper divisors (251692489).

1220128055 is a wasteful number, since it uses less digits than its factorization.

1220128055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1277817.

The product of its (nonzero) digits is 1600, while the sum is 26.

The square root of 1220128055 is about 34930.3314470390. The cubic root of 1220128055 is about 1068.5671142438.

Adding to 1220128055 its reverse (5508210221), we get a palindrome (6728338276).

The spelling of 1220128055 in words is "one billion, two hundred twenty million, one hundred twenty-eight thousand, fifty-five".