42720583 has 4 divisors (see below), whose sum is σ = 42790888. Its totient is φ = 42650280.

The previous prime is 42720577. The next prime is 42720599. The reversal of 42720583 is 38502724.

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 42720583 - 2¹⁷ = 42589511 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 (42720283) 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, 34233 + ... + 35458.

It is an arithmetic number, because the mean of its divisors is an integer number (10697722).

Almost surely, 2^42720583 is an apocalyptic number.

42720583 is a deficient number, since it is larger than the sum of its proper divisors (70305).

42720583 is an equidigital number, since it uses as much as digits as its factorization.

42720583 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70304.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 42720583 is about 6536.0984539708. The cubic root of 42720583 is about 349.5793122377.

The spelling of 42720583 in words is "forty-two million, seven hundred twenty thousand, five hundred eighty-three".