128505310 has 16 divisors (see below), whose sum is σ = 231440976. Its totient is φ = 51372928.

The previous prime is 128505277. The next prime is 128505319. The reversal of 128505310 is 13505821.

It is a happy number.

It is a super-2 number, since 2×128505310² = 33027229396392200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128505319) 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 7 ways as a sum of consecutive naturals, for example, 27462 + ... + 31798.

It is an arithmetic number, because the mean of its divisors is an integer number (14465061).

Almost surely, 2^128505310 is an apocalyptic number.

128505310 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128505310 is a deficient number, since it is larger than the sum of its proper divisors (102935666).

128505310 is a wasteful number, since it uses less digits than its factorization.

128505310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7307.

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 128505310 is about 11336.0182603946. The cubic root of 128505310 is about 504.6307270021.

The spelling of 128505310 in words is "one hundred twenty-eight million, five hundred five thousand, three hundred ten".