42728669 has 2 divisors, whose sum is σ = 42728670. Its totient is φ = 42728668.

The previous prime is 42728617. The next prime is 42728671. The reversal of 42728669 is 96682724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25381444 + 17347225 = 5038^2 + 4165^2 .

It is a cyclic number.

It is not a de Polignac number, because 42728669 - 2¹⁶ = 42663133 is a prime.

It is a super-2 number, since 2×42728669² = 3651478309023122, which contains 22 as substring.

Together with 42728671, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42728689) 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, 21364334 + 21364335.

It is an arithmetic number, because the mean of its divisors is an integer number (21364335).

Almost surely, 2^42728669 is an apocalyptic number.

It is an amenable number.

42728669 is a deficient number, since it is larger than the sum of its proper divisors (1).

42728669 is an equidigital number, since it uses as much as digits as its factorization.

42728669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 290304, while the sum is 44.

The square root of 42728669 is about 6536.7169894374. The cubic root of 42728669 is about 349.6013665559.

The spelling of 42728669 in words is "forty-two million, seven hundred twenty-eight thousand, six hundred sixty-nine".