128036665 has 16 divisors (see below), whose sum is σ = 160980480. Its totient is φ = 97637760.

The previous prime is 128036641. The next prime is 128036677. The reversal of 128036665 is 566630821.

It is not a de Polignac number, because 128036665 - 2⁵ = 128036633 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4221 + ... + 16549.

It is an arithmetic number, because the mean of its divisors is an integer number (10061280).

Almost surely, 2^128036665 is an apocalyptic number.

It is an amenable number.

128036665 is a deficient number, since it is larger than the sum of its proper divisors (32943815).

128036665 is a wasteful number, since it uses less digits than its factorization.

128036665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12432.

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

The square root of 128036665 is about 11315.3287623471. The cubic root of 128036665 is about 504.0165351613.

The spelling of 128036665 in words is "one hundred twenty-eight million, thirty-six thousand, six hundred sixty-five".