128278234256415 has 8 divisors (see below), whose sum is σ = 205245174810288. Its totient is φ = 68415058270080.

The previous prime is 128278234256413. The next prime is 128278234256483. The reversal of 128278234256415 is 514652432872821.

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

It is not a de Polignac number, because 128278234256415 - 2¹ = 128278234256413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128278234256413) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4275941141866 + ... + 4275941141895.

It is an arithmetic number, because the mean of its divisors is an integer number (25655646851286).

Almost surely, 2^{128278234256415} is an apocalyptic number.

128278234256415 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128278234256415 is a deficient number, since it is larger than the sum of its proper divisors (76966940553873).

128278234256415 is an equidigital number, since it uses as much as digits as its factorization.

128278234256415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8551882283769.

The product of its digits is 51609600, while the sum is 60.

The spelling of 128278234256415 in words is "one hundred twenty-eight trillion, two hundred seventy-eight billion, two hundred thirty-four million, two hundred fifty-six thousand, four hundred fifteen".