128779270 has 32 divisors (see below), whose sum is σ = 241238016. Its totient is φ = 49442400.

The previous prime is 128779229. The next prime is 128779279. The reversal of 128779270 is 72977821.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128779279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37735 + ... + 41005.

It is an arithmetic number, because the mean of its divisors is an integer number (7538688).

Almost surely, 2^128779270 is an apocalyptic number.

128779270 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128779270 is a deficient number, since it is larger than the sum of its proper divisors (112458746).

128779270 is a wasteful number, since it uses less digits than its factorization.

128779270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3436.

The product of its (nonzero) digits is 98784, while the sum is 43.

The square root of 128779270 is about 11348.0954349177. The cubic root of 128779270 is about 504.9890792658.

The spelling of 128779270 in words is "one hundred twenty-eight million, seven hundred seventy-nine thousand, two hundred seventy".