42720071 has 16 divisors (see below), whose sum is σ = 44945280. Its totient is φ = 40576800.

The previous prime is 42720059. The next prime is 42720079. The reversal of 42720071 is 17002724.

It is a cyclic number.

It is not a de Polignac number, because 42720071 - 2¹⁸ = 42457927 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42720079) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 399200 + ... + 399306.

It is an arithmetic number, because the mean of its divisors is an integer number (2809080).

Almost surely, 2^42720071 is an apocalyptic number.

42720071 is a deficient number, since it is larger than the sum of its proper divisors (2225209).

42720071 is a wasteful number, since it uses less digits than its factorization.

42720071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 42720071 is about 6536.0592867568. The cubic root of 42720071 is about 349.5779156796.

Adding to 42720071 its reverse (17002724), we get a palindrome (59722795).

The spelling of 42720071 in words is "forty-two million, seven hundred twenty thousand, seventy-one".