128220356 has 24 divisors (see below), whose sum is σ = 249407424. Its totient is φ = 57181280.

The previous prime is 128220349. The next prime is 128220359. The reversal of 128220356 is 653022821.

It is not an unprimeable number, because it can be changed into a prime (128220359) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25160 + ... + 29823.

It is an arithmetic number, because the mean of its divisors is an integer number (10391976).

Almost surely, 2^128220356 is an apocalyptic number.

It is an amenable number.

128220356 is a deficient number, since it is larger than the sum of its proper divisors (121187068).

128220356 is a wasteful number, since it uses less digits than its factorization.

128220356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55051 (or 55049 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 128220356 is about 11323.4427626937. The cubic root of 128220356 is about 504.2574532894.

The spelling of 128220356 in words is "one hundred twenty-eight million, two hundred twenty thousand, three hundred fifty-six".