128765841 has 4 divisors (see below), whose sum is σ = 171687792. Its totient is φ = 85843892.

The previous prime is 128765839. The next prime is 128765843. The reversal of 128765841 is 148567821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (128765839) and next prime (128765843).

It is a cyclic number.

It is not a de Polignac number, because 128765841 - 2¹ = 128765839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128765793 and 128765802.

It is not an unprimeable number, because it can be changed into a prime (128765843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21460971 + ... + 21460976.

It is an arithmetic number, because the mean of its divisors is an integer number (42921948).

Almost surely, 2^128765841 is an apocalyptic number.

It is an amenable number.

128765841 is a deficient number, since it is larger than the sum of its proper divisors (42921951).

128765841 is an equidigital number, since it uses as much as digits as its factorization.

128765841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42921950.

The product of its digits is 107520, while the sum is 42.

The square root of 128765841 is about 11347.5037343021. The cubic root of 128765841 is about 504.9715253690.

The spelling of 128765841 in words is "one hundred twenty-eight million, seven hundred sixty-five thousand, eight hundred forty-one".