42747681 has 8 divisors (see below), whose sum is σ = 57081024. Its totient is φ = 28456400.

The previous prime is 42747631. The next prime is 42747697. The reversal of 42747681 is 18674724.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42747681 - 2⁷ = 42747553 is a prime.

It is a super-2 number, since 2×42747681² = 3654728461755522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42747631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8061 + ... + 12266.

It is an arithmetic number, because the mean of its divisors is an integer number (7135128).

Almost surely, 2^42747681 is an apocalyptic number.

It is an amenable number.

42747681 is a deficient number, since it is larger than the sum of its proper divisors (14333343).

42747681 is a wasteful number, since it uses less digits than its factorization.

42747681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21031.

The product of its digits is 75264, while the sum is 39.

The square root of 42747681 is about 6538.1710745437. The cubic root of 42747681 is about 349.6532102460.

The spelling of 42747681 in words is "forty-two million, seven hundred forty-seven thousand, six hundred eighty-one".