422664640 has 56 divisors (see below), whose sum is σ = 1008473472. Its totient is φ = 168729600.

The previous prime is 422664637. The next prime is 422664643. The reversal of 422664640 is 46466224.

It is an interprime number because it is at equal distance from previous prime (422664637) and next prime (422664643).

It is a junction number, because it is equal to n+sod(n) for n = 422664596 and 422664605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (422664643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215665 + ... + 217615.

Almost surely, 2^422664640 is an apocalyptic number.

422664640 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 422664640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (504236736).

422664640 is an abundant number, since it is smaller than the sum of its proper divisors (585808832).

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

422664640 is a wasteful number, since it uses less digits than its factorization.

422664640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645 (or 2635 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 34.

The square root of 422664640 is about 20558.8093040429. The cubic root of 422664640 is about 750.4676431674.

The spelling of 422664640 in words is "four hundred twenty-two million, six hundred sixty-four thousand, six hundred forty".