128566115 has 4 divisors (see below), whose sum is σ = 154279344. Its totient is φ = 102852888.

The previous prime is 128566093. The next prime is 128566127. The reversal of 128566115 is 511665821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 511665821 = 29 ⋅17643649.

It is a cyclic number.

It is not a de Polignac number, because 128566115 - 2¹⁶ = 128500579 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12856607 + ... + 12856616.

It is an arithmetic number, because the mean of its divisors is an integer number (38569836).

Almost surely, 2^128566115 is an apocalyptic number.

128566115 is a deficient number, since it is larger than the sum of its proper divisors (25713229).

128566115 is an equidigital number, since it uses as much as digits as its factorization.

128566115 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25713228.

The product of its digits is 14400, while the sum is 35.

The square root of 128566115 is about 11338.6998813797. The cubic root of 128566115 is about 504.7103066786.

The spelling of 128566115 in words is "one hundred twenty-eight million, five hundred sixty-six thousand, one hundred fifteen".