128917070 has 32 divisors (see below), whose sum is σ = 243093312. Its totient is φ = 49130752.

The previous prime is 128917049. The next prime is 128917073. The reversal of 128917070 is 70719821.

It is a super-2 number, since 2×128917070² = 33239221874769800, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128917070.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128917073) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 66434 + ... + 68346.

It is an arithmetic number, because the mean of its divisors is an integer number (7596666).

Almost surely, 2^128917070 is an apocalyptic number.

128917070 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128917070 is a deficient number, since it is larger than the sum of its proper divisors (114176242).

128917070 is a wasteful number, since it uses less digits than its factorization.

128917070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2236.

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 128917070 is about 11354.1653149846. The cubic root of 128917070 is about 505.1691359091.

The spelling of 128917070 in words is "one hundred twenty-eight million, nine hundred seventeen thousand, seventy".