128850005 has 8 divisors (see below), whose sum is σ = 154884312. Its totient is φ = 102903808.

The previous prime is 128849993. The next prime is 128850011. The reversal of 128850005 is 500058821.

It can be written as a sum of positive squares in 4 ways, for example, as 21893041 + 106956964 = 4679^2 + 10342^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 128850005 - 2¹⁰ = 128848981 is a prime.

It is a Duffinian number.

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 128850005.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18764 + ... + 24693.

It is an arithmetic number, because the mean of its divisors is an integer number (19360539).

Almost surely, 2^128850005 is an apocalyptic number.

It is an amenable number.

128850005 is a deficient number, since it is larger than the sum of its proper divisors (26034307).

128850005 is an equidigital number, since it uses as much as digits as its factorization.

128850005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44055.

The product of its (nonzero) digits is 3200, while the sum is 29.

The square root of 128850005 is about 11351.2116093393. The cubic root of 128850005 is about 505.0815213295.

The spelling of 128850005 in words is "one hundred twenty-eight million, eight hundred fifty thousand, five".