422320640 has 80 divisors (see below), whose sum is σ = 1157283072. Its totient is φ = 144789504.

The previous prime is 422320621. The next prime is 422320651. The reversal of 422320640 is 46023224.

It is a tau number, because it is divible by the number of its divisors (80).

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, 6137 + ... + 29703.

Almost surely, 2^422320640 is an apocalyptic number.

422320640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 422320640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (578641536).

422320640 is an abundant number, since it is smaller than the sum of its proper divisors (734962432).

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

422320640 is an equidigital number, since it uses as much as digits as its factorization.

422320640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23597 (or 23581 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 422320640 is about 20550.4413577908. The cubic root of 422320640 is about 750.2639900311.

Adding to 422320640 its reverse (46023224), we get a palindrome (468343864).

The spelling of 422320640 in words is "four hundred twenty-two million, three hundred twenty thousand, six hundred forty".