128850505 has 8 divisors (see below), whose sum is σ = 176709312. Its totient is φ = 88354608.

The previous prime is 128850503. The next prime is 128850529. The reversal of 128850505 is 505058821.

It is a happy number.

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 128850505 - 2¹ = 128850503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128850503) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1840687 + ... + 1840756.

It is an arithmetic number, because the mean of its divisors is an integer number (22088664).

Almost surely, 2^128850505 is an apocalyptic number.

It is an amenable number.

128850505 is a deficient number, since it is larger than the sum of its proper divisors (47858807).

128850505 is an equidigital number, since it uses as much as digits as its factorization.

128850505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3681455.

The product of its (nonzero) digits is 16000, while the sum is 34.

The square root of 128850505 is about 11351.2336333986. The cubic root of 128850505 is about 505.0821746484.

The spelling of 128850505 in words is "one hundred twenty-eight million, eight hundred fifty thousand, five hundred five".