128208442 has 4 divisors (see below), whose sum is σ = 192312666. Its totient is φ = 64104220.

The previous prime is 128208439. The next prime is 128208461. The reversal of 128208442 is 244802821.

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., 120362841 + 7845601 = 10971^2 + 2801^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32052109 + ... + 32052112.

Almost surely, 2^128208442 is an apocalyptic number.

128208442 is a deficient number, since it is larger than the sum of its proper divisors (64104224).

128208442 is an equidigital number, since it uses as much as digits as its factorization.

128208442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64104223.

The product of its (nonzero) digits is 8192, while the sum is 31.

The square root of 128208442 is about 11322.9166737197. The cubic root of 128208442 is about 504.2418345801.

The spelling of 128208442 in words is "one hundred twenty-eight million, two hundred eight thousand, four hundred forty-two".