442646644 has 48 divisors (see below), whose sum is σ = 892717056. Its totient is φ = 190159200.

The previous prime is 442646609. The next prime is 442646647. The reversal of 442646644 is 446646244.

It is a happy number.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 442646597 and 442646606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442646647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54879 + ... + 62425.

It is an arithmetic number, because the mean of its divisors is an integer number (18598272).

Almost surely, 2^442646644 is an apocalyptic number.

442646644 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

442646644 is an abundant number, since it is smaller than the sum of its proper divisors (450070412).

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

442646644 is a wasteful number, since it uses less digits than its factorization.

442646644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7636 (or 7634 counting only the distinct ones).

The product of its digits is 442368, while the sum is 40.

The square root of 442646644 is about 21039.1692801783. The cubic root of 442646644 is about 762.1124539248.

The spelling of 442646644 in words is "four hundred forty-two million, six hundred forty-six thousand, six hundred forty-four".