42644140 has 48 divisors (see below), whose sum is σ = 111654144. Its totient is φ = 13291200.

The previous prime is 42644137. The next prime is 42644153. The reversal of 42644140 is 4144624.

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, 12306 + ... + 15385.

It is an arithmetic number, because the mean of its divisors is an integer number (2326128).

Almost surely, 2^42644140 is an apocalyptic number.

It is an amenable number.

42644140 is an abundant number, since it is smaller than the sum of its proper divisors (69010004).

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

42644140 is a wasteful number, since it uses less digits than its factorization.

42644140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27718 (or 27716 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 42644140 is about 6530.2480810456. The cubic root of 42644140 is about 349.3706786438.

Adding to 42644140 its reverse (4144624), we get a palindrome (46788764).

The spelling of 42644140 in words is "forty-two million, six hundred forty-four thousand, one hundred forty".