42644661 has 8 divisors (see below), whose sum is σ = 57076800. Its totient is φ = 28321152.

The previous prime is 42644639. The next prime is 42644663. The reversal of 42644661 is 16644624.

42644661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42644661 - 2⁶ = 42644597 is a prime.

It is a super-2 number, since 2×42644661² = 3637134223609842, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42644663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26236 + ... + 27813.

It is an arithmetic number, because the mean of its divisors is an integer number (7134600).

Almost surely, 2^42644661 is an apocalyptic number.

It is an amenable number.

42644661 is a deficient number, since it is larger than the sum of its proper divisors (14432139).

42644661 is a wasteful number, since it uses less digits than its factorization.

42644661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54315.

The product of its digits is 27648, while the sum is 33.

The square root of 42644661 is about 6530.2879722107. The cubic root of 42644661 is about 349.3721014371.

The spelling of 42644661 in words is "forty-two million, six hundred forty-four thousand, six hundred sixty-one".