128887565 has 16 divisors (see below), whose sum is σ = 159658560. Its totient is φ = 99834240.

The previous prime is 128887547. The next prime is 128887567. The reversal of 128887565 is 565788821.

It is a de Polignac number, because none of the positive numbers 2^k-128887565 is a prime.

It is a super-2 number, since 2×128887565² = 33224008823258450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128887567) 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, 16505 + ... + 23025.

It is an arithmetic number, because the mean of its divisors is an integer number (9978660).

Almost surely, 2^128887565 is an apocalyptic number.

It is an amenable number.

128887565 is a deficient number, since it is larger than the sum of its proper divisors (30770995).

128887565 is an equidigital number, since it uses as much as digits as its factorization.

128887565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6652.

The product of its digits is 1075200, while the sum is 50.

The square root of 128887565 is about 11352.8659377269. The cubic root of 128887565 is about 505.1305939415.

The spelling of 128887565 in words is "one hundred twenty-eight million, eight hundred eighty-seven thousand, five hundred sixty-five".