128706244815 has 16 divisors (see below), whose sum is σ = 216768412800. Its totient is φ = 65030523552.

The previous prime is 128706244747. The next prime is 128706244837. The reversal of 128706244815 is 518442607821.

It is a happy number.

It is not a de Polignac number, because 128706244815 - 2¹¹ = 128706242767 is a prime.

It is a super-4 number, since 4×128706244815⁴ (a number of 46 digits) contains 4444 as substring.

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, 225800145 + ... + 225800714.

It is an arithmetic number, because the mean of its divisors is an integer number (13548025800).

Almost surely, 2^128706244815 is an apocalyptic number.

128706244815 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128706244815 is a deficient number, since it is larger than the sum of its proper divisors (88062167985).

128706244815 is a wasteful number, since it uses less digits than its factorization.

128706244815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451600886.

The product of its (nonzero) digits is 860160, while the sum is 48.

The spelling of 128706244815 in words is "one hundred twenty-eight billion, seven hundred six million, two hundred forty-four thousand, eight hundred fifteen".