128665630 has 16 divisors (see below), whose sum is σ = 231730704. Its totient is φ = 51436800.

The previous prime is 128665619. The next prime is 128665631. The reversal of 128665630 is 36566821.

It is a self number, because there is not a number n which added to its sum of digits gives 128665630.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128665631) 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, 26254 + ... + 30766.

It is an arithmetic number, because the mean of its divisors is an integer number (14483169).

Almost surely, 2^128665630 is an apocalyptic number.

128665630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128665630 is a deficient number, since it is larger than the sum of its proper divisors (103065074).

128665630 is a wasteful number, since it uses less digits than its factorization.

128665630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7371.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 128665630 is about 11343.0873222417. The cubic root of 128665630 is about 504.8404946698.

It can be divided in two parts, 12866 and 5630, that added together give a square (18496 = 136²).

The spelling of 128665630 in words is "one hundred twenty-eight million, six hundred sixty-five thousand, six hundred thirty".