42644636 has 24 divisors (see below), whose sum is σ = 79770096. Its totient is φ = 19877120.

The previous prime is 42644627. The next prime is 42644639. The reversal of 42644636 is 63644624.

It is a junction number, because it is equal to n+sod(n) for n = 42644596 and 42644605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42644639) 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, 4346 + ... + 10206.

It is an arithmetic number, because the mean of its divisors is an integer number (3323754).

Almost surely, 2^42644636 is an apocalyptic number.

It is an amenable number.

42644636 is a deficient number, since it is larger than the sum of its proper divisors (37125460).

42644636 is a wasteful number, since it uses less digits than its factorization.

42644636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5989 (or 5987 counting only the distinct ones).

The product of its digits is 82944, while the sum is 35.

The square root of 42644636 is about 6530.2860580529. The cubic root of 42644636 is about 349.3720331651.

The spelling of 42644636 in words is "forty-two million, six hundred forty-four thousand, six hundred thirty-six".