128440326 has 32 divisors (see below), whose sum is σ = 306344448. Its totient is φ = 35101440.

The previous prime is 128440289. The next prime is 128440337. The reversal of 128440326 is 623044821.

It is a super-3 number, since 3×128440326³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 128440293 and 128440302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65515 + ... + 67446.

It is an arithmetic number, because the mean of its divisors is an integer number (9573264).

Almost surely, 2^128440326 is an apocalyptic number.

128440326 is an abundant number, since it is smaller than the sum of its proper divisors (177904122).

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

128440326 is a wasteful number, since it uses less digits than its factorization.

128440326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132996.

The product of its (nonzero) digits is 9216, while the sum is 30.

The square root of 128440326 is about 11333.1516357984. The cubic root of 128440326 is about 504.5456502261.

The spelling of 128440326 in words is "one hundred twenty-eight million, four hundred forty thousand, three hundred twenty-six".