442006644 has 24 divisors (see below), whose sum is σ = 1050809760. Its totient is φ = 144555424.

The previous prime is 442006639. The next prime is 442006657. The reversal of 442006644 is 446600244.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 346854 + ... + 348125.

It is an arithmetic number, because the mean of its divisors is an integer number (43783740).

Almost surely, 2^442006644 is an apocalyptic number.

It is an amenable number.

442006644 is an abundant number, since it is smaller than the sum of its proper divisors (608803116).

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

442006644 is a wasteful number, since it uses less digits than its factorization.

442006644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695039 (or 695037 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 30.

The square root of 442006644 is about 21023.9540524612. The cubic root of 442006644 is about 761.7449770385.

Adding to 442006644 its reverse (446600244), we get a palindrome (888606888).

The spelling of 442006644 in words is "four hundred forty-two million, six thousand, six hundred forty-four".