42540644 has 12 divisors (see below), whose sum is σ = 75495168. Its totient is φ = 20970600.

The previous prime is 42540637. The next prime is 42540679. The reversal of 42540644 is 44604524.

It is a happy number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 74612 + ... + 75179.

It is an arithmetic number, because the mean of its divisors is an integer number (6291264).

Almost surely, 2^42540644 is an apocalyptic number.

It is an amenable number.

42540644 is a deficient number, since it is larger than the sum of its proper divisors (32954524).

42540644 is a wasteful number, since it uses less digits than its factorization.

42540644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149866 (or 149864 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 29.

The square root of 42540644 is about 6522.3189127794. The cubic root of 42540644 is about 349.0878124314.

The spelling of 42540644 in words is "forty-two million, five hundred forty thousand, six hundred forty-four".