42044664 has 64 divisors (see below), whose sum is σ = 109648800. Its totient is φ = 13418496.

The previous prime is 42044659. The next prime is 42044699. The reversal of 42044664 is 46644024.

42044664 = T₁₁₁ + T₁₁₂ + ... + T₆₃₂.

It is a congruent 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 15 ways as a sum of consecutive naturals, for example, 134172 + ... + 134484.

Almost surely, 2^42044664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42044664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54824400).

42044664 is an abundant number, since it is smaller than the sum of its proper divisors (67604136).

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

42044664 is a wasteful number, since it uses less digits than its factorization.

42044664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544 (or 540 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 42044664 is about 6484.1856851882. The cubic root of 42044664 is about 347.7258377053.

Adding to 42044664 its reverse (46644024), we get a palindrome (88688688).

The spelling of 42044664 in words is "forty-two million, forty-four thousand, six hundred sixty-four".