128212858 has 4 divisors (see below), whose sum is σ = 192319290. Its totient is φ = 64106428.

The previous prime is 128212853. The next prime is 128212871. The reversal of 128212858 is 858212821.

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., 121947849 + 6265009 = 11043^2 + 2503^2 .

It is not an unprimeable number, because it can be changed into a prime (128212853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32053213 + ... + 32053216.

Almost surely, 2^128212858 is an apocalyptic number.

128212858 is a deficient number, since it is larger than the sum of its proper divisors (64106432).

128212858 is an equidigital number, since it uses as much as digits as its factorization.

128212858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64106431.

The product of its digits is 20480, while the sum is 37.

The square root of 128212858 is about 11323.1116748004. Note that the first 3 decimals coincide. The cubic root of 128212858 is about 504.2476238670.

Subtracting from 128212858 its sum of digits (37), we obtain a palindrome (128212821).

The spelling of 128212858 in words is "one hundred twenty-eight million, two hundred twelve thousand, eight hundred fifty-eight".