128755215 has 24 divisors (see below), whose sum is σ = 230873760. Its totient is φ = 66300864.

The previous prime is 128755199. The next prime is 128755217. The reversal of 128755215 is 512557821.

128755215 is a `hidden beast` number, since 12 + 87 + 552 + 15 = 666.

It is not a de Polignac number, because 128755215 - 2⁴ = 128755199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128755215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128755217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 48027 + ... + 50636.

It is an arithmetic number, because the mean of its divisors is an integer number (9619740).

Almost surely, 2^128755215 is an apocalyptic number.

128755215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128755215 is a deficient number, since it is larger than the sum of its proper divisors (102118545).

128755215 is a wasteful number, since it uses less digits than its factorization.

128755215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98703 (or 98700 counting only the distinct ones).

The product of its digits is 28000, while the sum is 36.

The square root of 128755215 is about 11347.0355159398. The cubic root of 128755215 is about 504.9576345860.

The spelling of 128755215 in words is "one hundred twenty-eight million, seven hundred fifty-five thousand, two hundred fifteen".