128718408 has 64 divisors (see below), whose sum is σ = 396063360. Its totient is φ = 33947136.

The previous prime is 128718377. The next prime is 128718409. The reversal of 128718408 is 804817821.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (128718409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 27285 + ... + 31652.

It is an arithmetic number, because the mean of its divisors is an integer number (6188490).

Almost surely, 2^128718408 is an apocalyptic number.

It is an amenable number.

128718408 is an abundant number, since it is smaller than the sum of its proper divisors (267344952).

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

128718408 is a wasteful number, since it uses less digits than its factorization.

128718408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58966 (or 58962 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 39.

The square root of 128718408 is about 11345.4135226531. The cubic root of 128718408 is about 504.9095129184.

The spelling of 128718408 in words is "one hundred twenty-eight million, seven hundred eighteen thousand, four hundred eight".