128311258 has 4 divisors (see below), whose sum is σ = 192466890. Its totient is φ = 64155628.

The previous prime is 128311241. The next prime is 128311259. The reversal of 128311258 is 852113821.

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

It can be written as a sum of positive squares in only one way, i.e., 118744609 + 9566649 = 10897^2 + 3093^2 .

It is not an unprimeable number, because it can be changed into a prime (128311259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32077813 + ... + 32077816.

Almost surely, 2^128311258 is an apocalyptic number.

128311258 is a deficient number, since it is larger than the sum of its proper divisors (64155632).

128311258 is an equidigital number, since it uses as much as digits as its factorization.

128311258 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64155631.

The product of its digits is 3840, while the sum is 31.

The square root of 128311258 is about 11327.4559367936. The cubic root of 128311258 is about 504.3765898144.

The spelling of 128311258 in words is "one hundred twenty-eight million, three hundred eleven thousand, two hundred fifty-eight".