128378085 has 16 divisors (see below), whose sum is σ = 224078400. Its totient is φ = 62243840.

The previous prime is 128378071. The next prime is 128378113. The reversal of 128378085 is 580873821.

It is a happy number.

It is not a de Polignac number, because 128378085 - 2⁴ = 128378069 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 388860 + ... + 389189.

It is an arithmetic number, because the mean of its divisors is an integer number (14004900).

Almost surely, 2^128378085 is an apocalyptic number.

128378085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128378085 is a deficient number, since it is larger than the sum of its proper divisors (95700315).

128378085 is a wasteful number, since it uses less digits than its factorization.

128378085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 778068.

The product of its (nonzero) digits is 107520, while the sum is 42.

The square root of 128378085 is about 11330.4053325554. The cubic root of 128378085 is about 504.4641376649.

The spelling of 128378085 in words is "one hundred twenty-eight million, three hundred seventy-eight thousand, eighty-five".