42720481 has 4 divisors (see below), whose sum is σ = 42754864. Its totient is φ = 42686100.

The previous prime is 42720427. The next prime is 42720497. The reversal of 42720481 is 18402724.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 42720481 - 2¹³ = 42712289 is a prime.

It is a super-2 number, since 2×42720481² = 3650078993742722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42720281) 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, 15255 + ... + 17836.

It is an arithmetic number, because the mean of its divisors is an integer number (10688716).

Almost surely, 2^42720481 is an apocalyptic number.

It is an amenable number.

42720481 is a deficient number, since it is larger than the sum of its proper divisors (34383).

42720481 is a wasteful number, since it uses less digits than its factorization.

42720481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34382.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 42720481 is about 6536.0906511461. The cubic root of 42720481 is about 349.5790340180.

The spelling of 42720481 in words is "forty-two million, seven hundred twenty thousand, four hundred eighty-one".