128198440 has 16 divisors (see below), whose sum is σ = 288446580. Its totient is φ = 51279360.

The previous prime is 128198429. The next prime is 128198443. The reversal of 128198440 is 44891821.

It can be written as a sum of positive squares in 2 ways, for example, as 128006596 + 191844 = 11314^2 + 438^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 128198440.

It is not an unprimeable number, because it can be changed into a prime (128198443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1602441 + ... + 1602520.

Almost surely, 2^128198440 is an apocalyptic number.

128198440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128198440 is an abundant number, since it is smaller than the sum of its proper divisors (160248140).

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

128198440 is a wasteful number, since it uses less digits than its factorization.

128198440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3204972 (or 3204968 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 128198440 is about 11322.4749944524. The cubic root of 128198440 is about 504.2287216683.

The spelling of 128198440 in words is "one hundred twenty-eight million, one hundred ninety-eight thousand, four hundred forty".