128775278 has 4 divisors (see below), whose sum is σ = 193162920. Its totient is φ = 64387638.

The previous prime is 128775233. The next prime is 128775307. The reversal of 128775278 is 872577821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 872577821 = 6553 ⋅133157.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32193818 + ... + 32193821.

It is an arithmetic number, because the mean of its divisors is an integer number (48290730).

Almost surely, 2^128775278 is an apocalyptic number.

128775278 is a deficient number, since it is larger than the sum of its proper divisors (64387642).

128775278 is an equidigital number, since it uses as much as digits as its factorization.

128775278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64387641.

The product of its digits is 439040, while the sum is 47.

The square root of 128775278 is about 11347.9195450091. The cubic root of 128775278 is about 504.9838611971.

The spelling of 128775278 in words is "one hundred twenty-eight million, seven hundred seventy-five thousand, two hundred seventy-eight".