42128266 has 4 divisors (see below), whose sum is σ = 63192402. Its totient is φ = 21064132.

The previous prime is 42128257. The next prime is 42128351. The reversal of 42128266 is 66282124.

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., 33977241 + 8151025 = 5829^2 + 2855^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10532065 + ... + 10532068.

Almost surely, 2^42128266 is an apocalyptic number.

42128266 is a deficient number, since it is larger than the sum of its proper divisors (21064136).

42128266 is a wasteful number, since it uses less digits than its factorization.

42128266 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21064135.

The product of its digits is 9216, while the sum is 31.

The square root of 42128266 is about 6490.6290912361. The cubic root of 42128266 is about 347.9561588758.

The spelling of 42128266 in words is "forty-two million, one hundred twenty-eight thousand, two hundred sixty-six".