444009780 has 72 divisors (see below), whose sum is σ = 1357504512. Its totient is φ = 117464256.

The previous prime is 444009767. The next prime is 444009781. The reversal of 444009780 is 87900444.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444009781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13149 + ... + 32571.

Almost surely, 2^444009780 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 444009780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (678752256).

444009780 is an abundant number, since it is smaller than the sum of its proper divisors (913494732).

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

444009780 is a wasteful number, since it uses less digits than its factorization.

444009780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19565 (or 19560 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 444009780 is about 21071.5395735575. The cubic root of 444009780 is about 762.8939639317.

The spelling of 444009780 in words is "four hundred forty-four million, nine thousand, seven hundred eighty".