42813681 has 8 divisors (see below), whose sum is σ = 58412640. Its totient is φ = 27878592.

The previous prime is 42813677. The next prime is 42813689. The reversal of 42813681 is 18631824.

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

It is not a de Polignac number, because 42813681 - 2² = 42813677 is a prime.

It is a super-2 number, since 2×42813681² = 3666022561539522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42813689) 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, 165816 + ... + 166073.

It is an arithmetic number, because the mean of its divisors is an integer number (7301580).

Almost surely, 2^42813681 is an apocalyptic number.

It is an amenable number.

42813681 is a deficient number, since it is larger than the sum of its proper divisors (15598959).

42813681 is a wasteful number, since it uses less digits than its factorization.

42813681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331935.

The product of its digits is 9216, while the sum is 33.

The square root of 42813681 is about 6543.2164109099. The cubic root of 42813681 is about 349.8330659710.

The spelling of 42813681 in words is "forty-two million, eight hundred thirteen thousand, six hundred eighty-one".