128118440 has 32 divisors (see below), whose sum is σ = 295301160. Its totient is φ = 49996800.

The previous prime is 128118439. The next prime is 128118451. The reversal of 128118440 is 44811821.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 72556324 + 55562116 = 8518^2 + 7454^2 .

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, 37421 + ... + 40700.

Almost surely, 2^128118440 is an apocalyptic number.

128118440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128118440 is an abundant number, since it is smaller than the sum of its proper divisors (167182720).

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

128118440 is a wasteful number, since it uses less digits than its factorization.

128118440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78173 (or 78169 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 29.

The square root of 128118440 is about 11318.9416466382. The cubic root of 128118440 is about 504.1238147977.

The spelling of 128118440 in words is "one hundred twenty-eight million, one hundred eighteen thousand, four hundred forty".