128727365 has 16 divisors (see below), whose sum is σ = 167890800. Its totient is φ = 94182912.

The previous prime is 128727353. The next prime is 128727367. The reversal of 128727365 is 563727821.

It can be written as a sum of positive squares in 8 ways, for example, as 16176484 + 112550881 = 4022^2 + 10609^2 .

It is a cyclic number.

It is not a de Polignac number, because 128727365 - 2²⁴ = 111950149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128727367) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2000 + ... + 16169.

It is an arithmetic number, because the mean of its divisors is an integer number (10493175).

Almost surely, 2^128727365 is an apocalyptic number.

It is an amenable number.

128727365 is a deficient number, since it is larger than the sum of its proper divisors (39163435).

128727365 is a wasteful number, since it uses less digits than its factorization.

128727365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18296.

The product of its digits is 141120, while the sum is 41.

The square root of 128727365 is about 11345.8082567969. The cubic root of 128727365 is about 504.9212241924.

The spelling of 128727365 in words is "one hundred twenty-eight million, seven hundred twenty-seven thousand, three hundred sixty-five".