128436878 has 8 divisors (see below), whose sum is σ = 194172672. Its totient is φ = 63712656.

The previous prime is 128436877. The next prime is 128436881. The reversal of 128436878 is 878634821.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128436871) 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, 252575 + ... + 253082.

It is an arithmetic number, because the mean of its divisors is an integer number (24271584).

Almost surely, 2^128436878 is an apocalyptic number.

128436878 is a deficient number, since it is larger than the sum of its proper divisors (65735794).

128436878 is a wasteful number, since it uses less digits than its factorization.

128436878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505786.

The product of its digits is 516096, while the sum is 47.

The square root of 128436878 is about 11332.9995146916. Note that the first 3 decimals coincide. The cubic root of 128436878 is about 504.5411353175.

The spelling of 128436878 in words is "one hundred twenty-eight million, four hundred thirty-six thousand, eight hundred seventy-eight".