128289099 has 8 divisors (see below), whose sum is σ = 171321552. Its totient is φ = 85391360.

The previous prime is 128289079. The next prime is 128289107. The reversal of 128289099 is 990982821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128289099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128289079) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31434 + ... + 35279.

It is an arithmetic number, because the mean of its divisors is an integer number (21415194).

Almost surely, 2^128289099 is an apocalyptic number.

128289099 is a deficient number, since it is larger than the sum of its proper divisors (43032453).

128289099 is an equidigital number, since it uses as much as digits as its factorization.

128289099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67357.

The product of its (nonzero) digits is 186624, while the sum is 48.

The square root of 128289099 is about 11326.4777843776. The cubic root of 128289099 is about 504.3475533280.

The spelling of 128289099 in words is "one hundred twenty-eight million, two hundred eighty-nine thousand, ninety-nine".