2640220422 has 64 divisors (see below), whose sum is σ = 6203174400. Its totient is φ = 733582080.

The previous prime is 2640220397. The next prime is 2640220469. The reversal of 2640220422 is 2240220462.

It is a junction number, because it is equal to n+sod(n) for n = 2640220392 and 2640220401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 222229 + ... + 233807.

It is an arithmetic number, because the mean of its divisors is an integer number (96924600).

Almost surely, 2^2640220422 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2640220422, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3101587200).

2640220422 is an abundant number, since it is smaller than the sum of its proper divisors (3562953978).

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

2640220422 is a wasteful number, since it uses less digits than its factorization.

2640220422 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11741.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 2640220422 is about 51383.0752485680. The cubic root of 2640220422 is about 1382.1231098133.

Adding to 2640220422 its reverse (2240220462), we get a palindrome (4880440884).

The spelling of 2640220422 in words is "two billion, six hundred forty million, two hundred twenty thousand, four hundred twenty-two".