128309284 has 12 divisors (see below), whose sum is σ = 225396864. Its totient is φ = 63910184.

The previous prime is 128309281. The next prime is 128309287. The reversal of 128309284 is 482903821.

It is an interprime number because it is at equal distance from previous prime (128309281) and next prime (128309287).

It is not an unprimeable number, because it can be changed into a prime (128309281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59932 + ... + 62035.

It is an arithmetic number, because the mean of its divisors is an integer number (18783072).

Almost surely, 2^128309284 is an apocalyptic number.

It is an amenable number.

128309284 is a deficient number, since it is larger than the sum of its proper divisors (97087580).

128309284 is a wasteful number, since it uses less digits than its factorization.

128309284 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122234 (or 122232 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 128309284 is about 11327.3688030363. The cubic root of 128309284 is about 504.3740032799.

The spelling of 128309284 in words is "one hundred twenty-eight million, three hundred nine thousand, two hundred eighty-four".