42644643 has 4 divisors (see below), whose sum is σ = 56859528. Its totient is φ = 28429760.

The previous prime is 42644639. The next prime is 42644663. The reversal of 42644643 is 34644624.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 42644643 - 2² = 42644639 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42644603) 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, 7107438 + ... + 7107443.

It is an arithmetic number, because the mean of its divisors is an integer number (14214882).

Almost surely, 2^42644643 is an apocalyptic number.

42644643 is a deficient number, since it is larger than the sum of its proper divisors (14214885).

42644643 is a wasteful number, since it uses less digits than its factorization.

42644643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14214884.

The product of its digits is 55296, while the sum is 33.

The square root of 42644643 is about 6530.2865940171. The cubic root of 42644643 is about 349.3720522812.

The spelling of 42644643 in words is "forty-two million, six hundred forty-four thousand, six hundred forty-three".