128220538 has 8 divisors (see below), whose sum is σ = 200693088. Its totient is φ = 61322844.

The previous prime is 128220529. The next prime is 128220553. The reversal of 128220538 is 835022821.

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

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 3 ways as a sum of consecutive naturals, for example, 1393656 + ... + 1393747.

It is an arithmetic number, because the mean of its divisors is an integer number (25086636).

Almost surely, 2^128220538 is an apocalyptic number.

128220538 is a deficient number, since it is larger than the sum of its proper divisors (72472550).

128220538 is a wasteful number, since it uses less digits than its factorization.

128220538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2787428.

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 128220538 is about 11323.4507991160. The cubic root of 128220538 is about 504.2576918755.

The spelling of 128220538 in words is "one hundred twenty-eight million, two hundred twenty thousand, five hundred thirty-eight".