128318646 has 16 divisors (see below), whose sum is σ = 256849344. Its totient is φ = 42737544.

The previous prime is 128318639. The next prime is 128318657. The reversal of 128318646 is 646813821.

It is a super-2 number, since 2×128318646² = 32931349822546632, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 340 + ... + 16023.

It is an arithmetic number, because the mean of its divisors is an integer number (16053084).

Almost surely, 2^128318646 is an apocalyptic number.

128318646 is an abundant number, since it is smaller than the sum of its proper divisors (128530698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128318646 is a wasteful number, since it uses less digits than its factorization.

128318646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17675.

The product of its digits is 55296, while the sum is 39.

The square root of 128318646 is about 11327.7820423947. The cubic root of 128318646 is about 504.3862700841.

The spelling of 128318646 in words is "one hundred twenty-eight million, three hundred eighteen thousand, six hundred forty-six".