2645620220 has 12 divisors (see below), whose sum is σ = 5555802504. Its totient is φ = 1058248080.

The previous prime is 2645620183. The next prime is 2645620253. The reversal of 2645620220 is 220265462.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66140486 + ... + 66140525.

It is an arithmetic number, because the mean of its divisors is an integer number (462983542).

Almost surely, 2^2645620220 is an apocalyptic number.

2645620220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2645620220 is an abundant number, since it is smaller than the sum of its proper divisors (2910182284).

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

2645620220 is a wasteful number, since it uses less digits than its factorization.

2645620220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132281020 (or 132281018 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 29.

The square root of 2645620220 is about 51435.5929294103. The cubic root of 2645620220 is about 1383.0647109254.

Adding to 2645620220 its reverse (220265462), we get a palindrome (2865885682).

The spelling of 2645620220 in words is "two billion, six hundred forty-five million, six hundred twenty thousand, two hundred twenty".