42647481 has 6 divisors (see below), whose sum is σ = 61601930. Its totient is φ = 28431648.

The previous prime is 42647477. The next prime is 42647557. The reversal of 42647481 is 18474624.

42647481 is a `hidden beast` number, since 4 + 2 + 647 + 4 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 42458256 + 189225 = 6516^2 + 435^2 .

It is not a de Polignac number, because 42647481 - 2² = 42647477 is a prime.

It is a super-2 number, since 2×42647481² = 3637615271290722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42647411) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2369296 + ... + 2369313.

Almost surely, 2^42647481 is an apocalyptic number.

It is an amenable number.

42647481 is a deficient number, since it is larger than the sum of its proper divisors (18954449).

42647481 is a wasteful number, since it uses less digits than its factorization.

42647481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4738615 (or 4738612 counting only the distinct ones).

The product of its digits is 43008, while the sum is 36.

The square root of 42647481 is about 6530.5038856125. The cubic root of 42647481 is about 349.3798023433.

The spelling of 42647481 in words is "forty-two million, six hundred forty-seven thousand, four hundred eighty-one".