444001644 has 18 divisors (see below), whose sum is σ = 1122337580. Its totient is φ = 148000536.

The previous prime is 444001643. The next prime is 444001763. The reversal of 444001644 is 446100444.

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (444001643) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6166654 + ... + 6166725.

Almost surely, 2^444001644 is an apocalyptic number.

It is an amenable number.

444001644 is an abundant number, since it is smaller than the sum of its proper divisors (678335936).

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

444001644 is a wasteful number, since it uses less digits than its factorization.

444001644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12333389 (or 12333384 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 27.

The square root of 444001644 is about 21071.3465160630. The cubic root of 444001644 is about 762.8893041671.

The spelling of 444001644 in words is "four hundred forty-four million, one thousand, six hundred forty-four".