128120226390 has 224 divisors, whose sum is σ = 391967462880. Its totient is φ = 29877009408.

The previous prime is 128120226323. The next prime is 128120226391. The reversal of 128120226390 is 93622021821.

It is a happy number.

128120226390 is a `hidden beast` number, since 1 + 2 + 8 + 12 + 0 + 2 + 2 + 639 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128120226391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 111 ways as a sum of consecutive naturals, for example, 1765054 + ... + 1836206.

It is an arithmetic number, because the mean of its divisors is an integer number (1749854745).

Almost surely, 2^128120226390 is an apocalyptic number.

128120226390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 128120226390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (195983731440).

128120226390 is an abundant number, since it is smaller than the sum of its proper divisors (263847236490).

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

128120226390 is a wasteful number, since it uses less digits than its factorization.

128120226390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71210 (or 71195 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 128120226390 in words is "one hundred twenty-eight billion, one hundred twenty million, two hundred twenty-six thousand, three hundred ninety".