442626644 has 6 divisors (see below), whose sum is σ = 774596634. Its totient is φ = 221313320.

The previous prime is 442626643. The next prime is 442626661. The reversal of 442626644 is 446626244.

It can be written as a sum of positive squares in only one way, i.e., 275958544 + 166668100 = 16612^2 + 12910^2 .

It is a junction number, because it is equal to n+sod(n) for n = 442626598 and 442626607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442626643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55328327 + ... + 55328334.

It is an arithmetic number, because the mean of its divisors is an integer number (129099439).

Almost surely, 2^442626644 is an apocalyptic number.

It is an amenable number.

442626644 is a deficient number, since it is larger than the sum of its proper divisors (331969990).

442626644 is a wasteful number, since it uses less digits than its factorization.

442626644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110656665 (or 110656663 counting only the distinct ones).

The product of its digits is 221184, while the sum is 38.

The square root of 442626644 is about 21038.6939708719. The cubic root of 442626644 is about 762.1009756355.

The spelling of 442626644 in words is "four hundred forty-two million, six hundred twenty-six thousand, six hundred forty-four".