128442240 has 128 divisors (see below), whose sum is σ = 454960800. Its totient is φ = 34246656.

The previous prime is 128442239. The next prime is 128442253. The reversal of 128442240 is 42244821.

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 13564 + ... + 20996.

Almost surely, 2^128442240 is an apocalyptic number.

128442240 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 128442240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (227480400).

128442240 is an abundant number, since it is smaller than the sum of its proper divisors (326518560).

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

128442240 is an equidigital number, since it uses as much as digits as its factorization.

128442240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7461 (or 7443 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 27.

The square root of 128442240 is about 11333.2360780141. The cubic root of 128442240 is about 504.5481564368.

The spelling of 128442240 in words is "one hundred twenty-eight million, four hundred forty-two thousand, two hundred forty".