42644013 has 8 divisors (see below), whose sum is σ = 57445248. Its totient is φ = 28136064.

The previous prime is 42643969. The next prime is 42644023. The reversal of 42644013 is 31044624.

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

It is not a de Polignac number, because 42644013 - 2⁹ = 42643501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42644023) 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, 72981 + ... + 73562.

It is an arithmetic number, because the mean of its divisors is an integer number (7180656).

Almost surely, 2^42644013 is an apocalyptic number.

It is an amenable number.

42644013 is a deficient number, since it is larger than the sum of its proper divisors (14801235).

42644013 is a wasteful number, since it uses less digits than its factorization.

42644013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146643.

The product of its (nonzero) digits is 2304, while the sum is 24.

The square root of 42644013 is about 6530.2383570586. The cubic root of 42644013 is about 349.3703318191.

Adding to 42644013 its reverse (31044624), we get a palindrome (73688637).

The spelling of 42644013 in words is "forty-two million, six hundred forty-four thousand, thirteen".