442561645 has 16 divisors (see below), whose sum is σ = 537818112. Its totient is φ = 349574400.

The previous prime is 442561631. The next prime is 442561681. The reversal of 442561645 is 546165244.

It is a de Polignac number, because none of the positive numbers 2^k-442561645 is a prime.

It is a super-3 number, since 3×442561645³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205444 + ... + 207586.

It is an arithmetic number, because the mean of its divisors is an integer number (33613632).

Almost surely, 2^442561645 is an apocalyptic number.

It is an amenable number.

442561645 is a deficient number, since it is larger than the sum of its proper divisors (95256467).

442561645 is a wasteful number, since it uses less digits than its factorization.

442561645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2652.

The product of its digits is 115200, while the sum is 37.

The square root of 442561645 is about 21037.1491652267. The cubic root of 442561645 is about 762.0636693813.

The spelling of 442561645 in words is "four hundred forty-two million, five hundred sixty-one thousand, six hundred forty-five".