128100705 has 8 divisors (see below), whose sum is σ = 204961152. Its totient is φ = 68320368.

The previous prime is 128100703. The next prime is 128100727. The reversal of 128100705 is 507001821.

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

It is not a de Polignac number, because 128100705 - 2¹ = 128100703 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (128100701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4270009 + ... + 4270038.

It is an arithmetic number, because the mean of its divisors is an integer number (25620144).

Almost surely, 2^128100705 is an apocalyptic number.

128100705 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128100705 is a deficient number, since it is larger than the sum of its proper divisors (76860447).

128100705 is an equidigital number, since it uses as much as digits as its factorization.

128100705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8540055.

The product of its (nonzero) digits is 560, while the sum is 24.

The square root of 128100705 is about 11318.1581982229. The cubic root of 128100705 is about 504.1005523425.

The spelling of 128100705 in words is "one hundred twenty-eight million, one hundred thousand, seven hundred five".