42621664 has 24 divisors (see below), whose sum is σ = 84407400. Its totient is φ = 21184896.

The previous prime is 42621661. The next prime is 42621671. The reversal of 42621664 is 46612624.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42621661) 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 3 ways as a sum of consecutive naturals, for example, 1687 + ... + 9385.

It is an arithmetic number, because the mean of its divisors is an integer number (3516975).

Almost surely, 2^42621664 is an apocalyptic number.

It is an amenable number.

42621664 is a deficient number, since it is larger than the sum of its proper divisors (41785736).

42621664 is a wasteful number, since it uses less digits than its factorization.

42621664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7882 (or 7874 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 42621664 is about 6528.5269395171. The cubic root of 42621664 is about 349.3092881429.

The spelling of 42621664 in words is "forty-two million, six hundred twenty-one thousand, six hundred sixty-four".