128320418 has 8 divisors (see below), whose sum is σ = 199117980. Its totient is φ = 61947760.

The previous prime is 128320417. The next prime is 128320421. The reversal of 128320418 is 814023821.

It can be written as a sum of positive squares in 2 ways, for example, as 112296409 + 16024009 = 10597^2 + 4003^2 .

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

It is a super-2 number, since 2×128320418² = 32932259351389448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128320417) 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, 1106153 + ... + 1106268.

Almost surely, 2^128320418 is an apocalyptic number.

128320418 is a deficient number, since it is larger than the sum of its proper divisors (70797562).

128320418 is a wasteful number, since it uses less digits than its factorization.

128320418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2212452.

The product of its (nonzero) digits is 3072, while the sum is 29.

The square root of 128320418 is about 11327.8602569064. The cubic root of 128320418 is about 504.3885918261.

The spelling of 128320418 in words is "one hundred twenty-eight million, three hundred twenty thousand, four hundred eighteen".