442644636 has 36 divisors (see below), whose sum is σ = 1201465608. Its totient is φ = 126469728.

The previous prime is 442644563. The next prime is 442644647. The reversal of 442644636 is 636446244.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 442644594 and 442644603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 375811 + ... + 376986.

Almost surely, 2^442644636 is an apocalyptic number.

It is an amenable number.

442644636 is an abundant number, since it is smaller than the sum of its proper divisors (758820972).

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

442644636 is a wasteful number, since it uses less digits than its factorization.

442644636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 752818 (or 752809 counting only the distinct ones).

The product of its digits is 331776, while the sum is 39.

The square root of 442644636 is about 21039.1215596089. The cubic root of 442644636 is about 762.1113015201. Note that the first 3 decimals are identical.

The spelling of 442644636 in words is "four hundred forty-two million, six hundred forty-four thousand, six hundred thirty-six".