444428561 has 8 divisors (see below), whose sum is σ = 455834400. Its totient is φ = 433049760.

The previous prime is 444428557. The next prime is 444428587. The reversal of 444428561 is 165824444.

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

It is a cyclic number.

It is not a de Polignac number, because 444428561 - 2² = 444428557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (444428591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28910 + ... + 41528.

It is an arithmetic number, because the mean of its divisors is an integer number (56979300).

Almost surely, 2^444428561 is an apocalyptic number.

444428561 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

444428561 is a deficient number, since it is larger than the sum of its proper divisors (11405839).

444428561 is a wasteful number, since it uses less digits than its factorization.

444428561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13519.

The product of its digits is 122880, while the sum is 38.

The square root of 444428561 is about 21081.4743554620. The cubic root of 444428561 is about 763.1337372581.

The spelling of 444428561 in words is "four hundred forty-four million, four hundred twenty-eight thousand, five hundred sixty-one".