2621643380 has 24 divisors (see below), whose sum is σ = 5556908448. Its totient is φ = 1038855968.

The previous prime is 2621643377. The next prime is 2621643383. The reversal of 2621643380 is 833461262.

It is an interprime number because it is at equal distance from previous prime (2621643377) and next prime (2621643383).

It is a self number, because there is not a number n which added to its sum of digits gives 2621643380.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621643383) 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, 610394 + ... + 614673.

It is an arithmetic number, because the mean of its divisors is an integer number (231537852).

Almost surely, 2^2621643380 is an apocalyptic number.

2621643380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2621643380 is an abundant number, since it is smaller than the sum of its proper divisors (2935265068).

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

2621643380 is a wasteful number, since it uses less digits than its factorization.

2621643380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1225183 (or 1225181 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 2621643380 is about 51201.9860942913. The cubic root of 2621643380 is about 1378.8738589769.

It can be divided in two parts, 26216 and 43380, that added together give a palindrome (69596).

The spelling of 2621643380 in words is "two billion, six hundred twenty-one million, six hundred forty-three thousand, three hundred eighty".