128849618 has 4 divisors (see below), whose sum is σ = 193274430. Its totient is φ = 64424808.

The previous prime is 128849603. The next prime is 128849627. The reversal of 128849618 is 816948821.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 101465329 + 27384289 = 10073^2 + 5233^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32212403 + ... + 32212406.

Almost surely, 2^128849618 is an apocalyptic number.

128849618 is a deficient number, since it is larger than the sum of its proper divisors (64424812).

128849618 is an equidigital number, since it uses as much as digits as its factorization.

128849618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64424811.

The product of its digits is 221184, while the sum is 47.

The square root of 128849618 is about 11351.1945626881. The cubic root of 128849618 is about 505.0810156595.

The spelling of 128849618 in words is "one hundred twenty-eight million, eight hundred forty-nine thousand, six hundred eighteen".