442640624 has 20 divisors (see below), whose sum is σ = 877562136. Its totient is φ = 216172992.

The previous prime is 442640623. The next prime is 442640669. The reversal of 442640624 is 426046244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442640623) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 320999 + ... + 322374.

Almost surely, 2^442640624 is an apocalyptic number.

It is an amenable number.

442640624 is a deficient number, since it is larger than the sum of its proper divisors (434921512).

442640624 is a wasteful number, since it uses less digits than its factorization.

442640624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643424 (or 643418 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 32.

The square root of 442640624 is about 21039.0262132067. The cubic root of 442640624 is about 762.1089989961.

Adding to 442640624 its reverse (426046244), we get a palindrome (868686868).

The spelling of 442640624 in words is "four hundred forty-two million, six hundred forty thousand, six hundred twenty-four".