128642208 has 48 divisors (see below), whose sum is σ = 339798816. Its totient is φ = 42612480.

The previous prime is 128642207. The next prime is 128642209. The reversal of 128642208 is 802246821.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (128642207) and next prime (128642209).

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (128642201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11538 + ... + 19758.

It is an arithmetic number, because the mean of its divisors is an integer number (7079142).

Almost surely, 2^128642208 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128642208, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (169899408).

128642208 is an abundant number, since it is smaller than the sum of its proper divisors (211156608).

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

128642208 is a wasteful number, since it uses less digits than its factorization.

128642208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8397 (or 8389 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 128642208 is about 11342.0548402836. The cubic root of 128642208 is about 504.8098594706.

The spelling of 128642208 in words is "one hundred twenty-eight million, six hundred forty-two thousand, two hundred eight".