128279659 has 4 divisors (see below), whose sum is σ = 135031240. Its totient is φ = 121528080.

The previous prime is 128279653. The next prime is 128279681. The reversal of 128279659 is 956972821.

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

It is a cyclic number.

It is not a de Polignac number, because 128279659 - 2¹⁵ = 128246891 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128279653) 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, 3375762 + ... + 3375799.

It is an arithmetic number, because the mean of its divisors is an integer number (33757810).

Almost surely, 2^128279659 is an apocalyptic number.

128279659 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

128279659 is a deficient number, since it is larger than the sum of its proper divisors (6751581).

128279659 is an equidigital number, since it uses as much as digits as its factorization.

128279659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6751580.

The product of its digits is 544320, while the sum is 49.

The square root of 128279659 is about 11326.0610540470. The cubic root of 128279659 is about 504.3351824207.

The spelling of 128279659 in words is "one hundred twenty-eight million, two hundred seventy-nine thousand, six hundred fifty-nine".