128397378 has 8 divisors (see below), whose sum is σ = 256794768. Its totient is φ = 42799124.

The previous prime is 128397377. The next prime is 128397391. The reversal of 128397378 is 873793821.

It is a sphenic number, since it is the product of 3 distinct primes.

128397378 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (128397377) 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, 10699776 + ... + 10699787.

It is an arithmetic number, because the mean of its divisors is an integer number (32099346).

Almost surely, 2^128397378 is an apocalyptic number.

128397378 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

128397378 is a wasteful number, since it uses less digits than its factorization.

128397378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21399568.

The product of its digits is 508032, while the sum is 48.

The square root of 128397378 is about 11331.2566822926. The cubic root of 128397378 is about 504.4894071365.

The spelling of 128397378 in words is "one hundred twenty-eight million, three hundred ninety-seven thousand, three hundred seventy-eight".