42646816 has 12 divisors (see below), whose sum is σ = 83960982. Its totient is φ = 21323392.

The previous prime is 42646801. The next prime is 42646817. The reversal of 42646816 is 61864624.

It can be written as a sum of positive squares in only one way, i.e., 41216400 + 1430416 = 6420^2 + 1196^2 .

It is not an unprimeable number, because it can be changed into a prime (42646817) 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 as a sum of consecutive naturals, namely, 666325 + ... + 666388.

Almost surely, 2^42646816 is an apocalyptic number.

It is an amenable number.

42646816 is a deficient number, since it is larger than the sum of its proper divisors (41314166).

42646816 is a wasteful number, since it uses less digits than its factorization.

42646816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1332723 (or 1332715 counting only the distinct ones).

The product of its digits is 55296, while the sum is 37.

The square root of 42646816 is about 6530.4529705067. The cubic root of 42646816 is about 349.3779863800.

The spelling of 42646816 in words is "forty-two million, six hundred forty-six thousand, eight hundred sixteen".