42644040 has 64 divisors (see below), whose sum is σ = 130671360. Its totient is φ = 11128320.

The previous prime is 42644039. The next prime is 42644051. The reversal of 42644040 is 4044624.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 42644040.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1860 + ... + 9420.

It is an arithmetic number, because the mean of its divisors is an integer number (2041740).

Almost surely, 2^42644040 is an apocalyptic number.

42644040 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42644040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65335680).

42644040 is an abundant number, since it is smaller than the sum of its proper divisors (88027320).

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

42644040 is a wasteful number, since it uses less digits than its factorization.

42644040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7622 (or 7618 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 42644040 is about 6530.2404243642. The cubic root of 42644040 is about 349.3704055536.

Adding to 42644040 its reverse (4044624), we get a palindrome (46688664).

The spelling of 42644040 in words is "forty-two million, six hundred forty-four thousand, forty".