42728113 has 4 divisors (see below), whose sum is σ = 42863220. Its totient is φ = 42593008.

The previous prime is 42728087. The next prime is 42728117. The reversal of 42728113 is 31182724.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25280784 + 17447329 = 5028^2 + 4177^2 .

It is a cyclic number.

It is not a de Polignac number, because 42728113 - 2¹⁷ = 42597041 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42728117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67078 + ... + 67711.

It is an arithmetic number, because the mean of its divisors is an integer number (10715805).

Almost surely, 2^42728113 is an apocalyptic number.

It is an amenable number.

42728113 is a deficient number, since it is larger than the sum of its proper divisors (135107).

42728113 is a wasteful number, since it uses less digits than its factorization.

42728113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135106.

The product of its digits is 2688, while the sum is 28.

The square root of 42728113 is about 6536.6744603047. The cubic root of 42728113 is about 349.5998501720.

The spelling of 42728113 in words is "forty-two million, seven hundred twenty-eight thousand, one hundred thirteen".