128372440 has 128 divisors (see below), whose sum is σ = 353808000. Its totient is φ = 40919040.

The previous prime is 128372411. The next prime is 128372459. The reversal of 128372440 is 44273821.

It is a super-3 number, since 3×128372440³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 709150 + ... + 709330.

It is an arithmetic number, because the mean of its divisors is an integer number (2764125).

Almost surely, 2^128372440 is an apocalyptic number.

128372440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128372440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176904000).

128372440 is an abundant number, since it is smaller than the sum of its proper divisors (225435560).

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

128372440 is a wasteful number, since it uses less digits than its factorization.

128372440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365 (or 361 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 128372440 is about 11330.1562213413. The cubic root of 128372440 is about 504.4567435114.

The spelling of 128372440 in words is "one hundred twenty-eight million, three hundred seventy-two thousand, four hundred forty".