42644020 has 48 divisors (see below), whose sum is σ = 92534400. Its totient is φ = 16499840.

The previous prime is 42643969. The next prime is 42644023. The reversal of 42644020 is 2044624.

It is a junction number, because it is equal to n+sod(n) for n = 42643982 and 42644000.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 83526 + ... + 84034.

It is an arithmetic number, because the mean of its divisors is an integer number (1927800).

Almost surely, 2^42644020 is an apocalyptic number.

It is an amenable number.

42644020 is an abundant number, since it is smaller than the sum of its proper divisors (49890380).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42644020 is a wasteful number, since it uses less digits than its factorization.

42644020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 42644020 is about 6530.2388930268. The cubic root of 42644020 is about 349.3703509355.

Adding to 42644020 its reverse (2044624), we get a palindrome (44688644).

The spelling of 42644020 in words is "forty-two million, six hundred forty-four thousand, twenty".