42720571 has 4 divisors (see below), whose sum is σ = 42769944. Its totient is φ = 42671200.

The previous prime is 42720539. The next prime is 42720577. The reversal of 42720571 is 17502724.

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

It is a cyclic number.

It is not a de Polignac number, because 42720571 - 2⁵ = 42720539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42720577) 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, 23365 + ... + 25126.

It is an arithmetic number, because the mean of its divisors is an integer number (10692486).

Almost surely, 2^42720571 is an apocalyptic number.

42720571 is a deficient number, since it is larger than the sum of its proper divisors (49373).

42720571 is an equidigital number, since it uses as much as digits as its factorization.

42720571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49372.

The product of its (nonzero) digits is 3920, while the sum is 28.

The square root of 42720571 is about 6536.0975359919. The cubic root of 42720571 is about 349.5792795060.

The spelling of 42720571 in words is "forty-two million, seven hundred twenty thousand, five hundred seventy-one".