4440400642644 has 12 divisors (see below), whose sum is σ = 10360934832864. Its totient is φ = 1480133547544.

The previous prime is 4440400642633. The next prime is 4440400642687. The reversal of 4440400642644 is 4462460040444.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 4440400642596 and 4440400642605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185016693432 + ... + 185016693455.

It is an arithmetic number, because the mean of its divisors is an integer number (863411236072).

Almost surely, 2^{4440400642644} is an apocalyptic number.

It is an amenable number.

4440400642644 is an abundant number, since it is smaller than the sum of its proper divisors (5920534190220).

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

4440400642644 is a wasteful number, since it uses less digits than its factorization.

4440400642644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370033386894 (or 370033386892 counting only the distinct ones).

The product of its (nonzero) digits is 1179648, while the sum is 42.

The spelling of 4440400642644 in words is "four trillion, four hundred forty billion, four hundred million, six hundred forty-two thousand, six hundred forty-four".