128288899 has 4 divisors (see below), whose sum is σ = 129057264. Its totient is φ = 127520536.

The previous prime is 128288873. The next prime is 128288903. The reversal of 128288899 is 998882821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128288899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128288099) 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, 383932 + ... + 384265.

It is an arithmetic number, because the mean of its divisors is an integer number (32264316).

Almost surely, 2^128288899 is an apocalyptic number.

128288899 is a deficient number, since it is larger than the sum of its proper divisors (768365).

128288899 is an equidigital number, since it uses as much as digits as its factorization.

128288899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 768364.

The product of its digits is 1327104, while the sum is 55.

The square root of 128288899 is about 11326.4689555042. The cubic root of 128288899 is about 504.3472912388.

The spelling of 128288899 in words is "one hundred twenty-eight million, two hundred eighty-eight thousand, eight hundred ninety-nine".