128239618 has 8 divisors (see below), whose sum is σ = 207156348. Its totient is φ = 59187504.

The previous prime is 128239613. The next prime is 128239633. The reversal of 128239618 is 816932821.

It can be written as a sum of positive squares in 2 ways, for example, as 125507209 + 2732409 = 11203^2 + 1653^2 .

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

It is not an unprimeable number, because it can be changed into a prime (128239613) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2466121 + ... + 2466172.

Almost surely, 2^128239618 is an apocalyptic number.

128239618 is a deficient number, since it is larger than the sum of its proper divisors (78916730).

128239618 is a wasteful number, since it uses less digits than its factorization.

128239618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4932308.

The product of its digits is 41472, while the sum is 40.

The square root of 128239618 is about 11324.2932671315. The cubic root of 128239618 is about 504.2827028442.

The spelling of 128239618 in words is "one hundred twenty-eight million, two hundred thirty-nine thousand, six hundred eighteen".