444778081 has 4 divisors (see below), whose sum is σ = 485212464. Its totient is φ = 404343700.

The previous prime is 444778079. The next prime is 444778091. The reversal of 444778081 is 180877444.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 444778081 - 2¹ = 444778079 is a prime.

It is a super-4 number, since 4×444778081⁴ (a number of 36 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (444778001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20217175 + ... + 20217196.

It is an arithmetic number, because the mean of its divisors is an integer number (121303116).

Almost surely, 2^444778081 is an apocalyptic number.

It is an amenable number.

444778081 is a deficient number, since it is larger than the sum of its proper divisors (40434383).

444778081 is a wasteful number, since it uses less digits than its factorization.

444778081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40434382.

The product of its (nonzero) digits is 200704, while the sum is 43.

The square root of 444778081 is about 21089.7624690275. The cubic root of 444778081 is about 763.3337398641. Note that the first 3 decimals are identical.

It can be divided in two parts, 4447 and 78081, that added together give a palindrome (82528).

The spelling of 444778081 in words is "four hundred forty-four million, seven hundred seventy-eight thousand, eighty-one".